Skip to content
🤔prompts chat🧠
🔍
question:Two vertices of an obtuse triangle are located at points (3, 2) and (0, 0). The third vertex is on the negative branch of the xaxis. Calculate the coordinates of the third vertex if the area of the triangle is 24 square units.

answer:To find the area of a triangle with vertices at (x_1, y_1), (x_2, y_2), and (x_3, y_3), we use the formula: [ text{Area} = frac{1}{2} left| x_1(y_2-y_3) + x_2(y_3-y_1) + x_3(y_1-y_2) right| ] In our scenario, let's denote the third vertex coordinates as (x, 0) since it lies on the x-axis. The other vertices are (3,2) and (0,0). Plugging into the area formula, we have: [ 24 = frac{1}{2} left| 3(0 - 0) + 0(0 - 2) + x(2 - 0) right| ] [ 24 = frac{1}{2} left| 2x right| = |x| ] So, x = pm 24. Since we are informed that the vertex is on the negative branch of the x-axis, we select x = -24. Thus, the coordinates of the third vertex are boxed{(-24, 0)}.

question:The polynomial P has integer coefficients and P(x)=5 for five different integers x . Show that there is no integer x such that 6le P(x)le 4 or 6le P(x)le 16 .

answer:1. Let ( P(x) ) be a polynomial with integer coefficients such that ( P(x) = 5 ) for five different integers ( x ). Let these integers be ( a, b, c, d, e ). Therefore, we have: [ P(a) = P(b) = P(c) = P(d) = P(e) = 5 ] 2. Define a new polynomial ( g(x) ) as follows: [ g(x) = P(x) - 5 ] Since ( P(a) = 5 ), ( P(b) = 5 ), ( P(c) = 5 ), ( P(d) = 5 ), and ( P(e) = 5 ), it follows that: [ g(a) = g(b) = g(c) = g(d) = g(e) = 0 ] Therefore, ( g(x) ) has roots at ( x = a, b, c, d, e ). Hence, ( g(x) ) can be factored as: [ g(x) = k(x - a)(x - b)(x - c)(x - d)(x - e) ] where ( k ) is a constant. 3. Since ( P(x) ) has integer coefficients, and ( P(x) = g(x) + 5 ), ( g(x) ) must also have integer coefficients. Therefore, ( k ) must be an integer. 4. We need to show that for any integer ( n ), ( g(n) ) cannot lie in the intervals ( -11 leq g(n) leq 4 ) or ( 6 leq g(n) leq 16 ). This is equivalent to showing that ( P(n) ) cannot lie in the intervals ( -6 leq P(n) leq 4 ) or ( 6 leq P(n) leq 16 ). 5. Consider the values ( g(n) ) can take. Since ( g(x) = k(x - a)(x - b)(x - c)(x - d)(x - e) ) and ( a, b, c, d, e ) are distinct integers, the smallest non-zero product of five distinct integers (in absolute value) is: [ |1 times (-1) times 2 times (-2) times 3| = 12 ] This is because the product of any five distinct integers, none of which are zero, will always be at least 12 in absolute value. 6. Therefore, the possible values of ( g(n) ) (other than 0) must satisfy ( |g(n)| geq 12 ). 7. Since ( g(n) ) cannot be in the range ( -11 leq g(n) leq 4 ) or ( 6 leq g(n) leq 16 ), it follows that ( P(n) = g(n) + 5 ) cannot be in the range ( -6 leq P(n) leq 4 ) or ( 6 leq P(n) leq 16 ). (blacksquare)

question:w many integers are there from 1 to 1,000,000 that are neither perfect squares, nor perfect cubes, nor fourth powers?

answer:To determine how many integers between 1 and 1,000,000 are neither perfect squares, perfect cubes, nor fourth powers, we will make use of the principle of inclusion and exclusion. 1. **Calculation of Perfect Squares:** - Calculate the highest integer ( n ) such that ( n^2 leq 1000000 ). - [ n = lfloor sqrt{1000000} rfloor = lfloor 1000 rfloor = 1000 ] - Therefore, there are 1000 perfect squares between 1 and 1000000. 2. **Calculation of Perfect Cubes:** - Calculate the highest integer ( m ) such that ( m^3 leq 1000000 ). - [ m = lfloor sqrt[3]{1000000} rfloor = lfloor 100 rfloor = 100 ] - Therefore, there are 100 perfect cubes between 1 and 1000000. 3. **Calculation of Sixth Powers:** - Sixth powers are numbers that are both perfect squares and perfect cubes, i.e., numbers of the form ( k^6 ). - Calculate the highest integer ( p ) such that ( p^6 leq 1000000 ). - [ p = lfloor sqrt[6]{1000000} rfloor = lfloor 10 rfloor = 10 ] - Therefore, there are 10 sixth powers between 1 and 1000000. 4. **Calculation of Fourth Powers:** - All fourth powers are also perfect squares. Therefore, we don't need to subtract them separately. We continue our calculations with these already included in the perfect squares. 5. **Applying the Principle of Inclusion and Exclusion:** - The principle of inclusion and exclusion for three sets is given by: [ |A cup B cup C| = |A| + |B| + |C| - |A cap B| - |A cap C| - |B cap C| + |A cap B cap C| ] - In this context, we only need to consider the overlaps of squares and cubes (sixth powers). - Therefore, the number of integers which are either perfect squares or perfect cubes or both is: [ 1000 + 100 - 10 = 1090 ] 6. **Final Calculation:** - Subtract the number of integers that are perfect squares, cubes, or both (i.e., sixth powers) from the total number of integers from 1 to 1000000. [ 1000000 - 1090 = 998910 ] # Conclusion: The number of integers between 1 and 1,000,000 that are neither perfect squares, perfect cubes, nor fourth powers is: [ boxed{998910} ]

question:Let s be a real number such that |s| < 3. Determine the magnitude of a complex number w where w + frac{1}{w} = s.

answer:Given the equation w + frac{1}{w} = s, we can multiply through by w to remove the fraction, resulting in [ w^2 + 1 = ws. ] Rewriting this, we have [ w^2 - sw + 1 = 0. ] Using the quadratic formula to solve for w, [ w = frac{s pm sqrt{s^2 - 4}}{2}. ] Suppose s^2 > 4, then the expression under the square root will be positive and real, leading to [ w = frac{s pm sqrt{s^2 - 4}}{2}. ] Now, if s^2 < 4, this introduces a complex component: [ w = frac{s pm isqrt{4 - s^2}}{2}. ] To find the magnitude of w, calculate [ |w| = sqrt{left(frac{s}{2}right)^2 + left(frac{sqrt{4 - s^2}}{2}right)^2} = sqrt{frac{s^2}{4} + frac{4 - s^2}{4}} = sqrt{1} = boxed{1}. ]

Released under the Aurora License.

has loaded