Question

Найдите значение функции y=x-5x^+7 при x=-2

Answer 1

$y=x-5x^2+7 \\ y=-2-5(-2)^2+7 \\ y=-2-5*2+7 \\ y=-2-10+7 \\ y=-5$

Answer 2

To find the value of the function y = x - 5x^2 + 7 at x = -2, we simply need to substitute -2 in place of x and evaluate the expression. So, we have:

y = (-2) - 5(-2)^2 + 7

Now, we solve the expression step by step:

y = -2 - 5(4) + 7 y = -2 - 20 + 7 y = -15

Therefore, when x = -2, the value of the function y is -15.