Question

Дана функция f(x)=7x2+3x−18. Вычисли f(-1)=

Answer 1

$f(x)=7x^2+3x-18\\ f(-1)=7\cdot(-1)^2+3\cdot(-1)-18=7\cdot 1-3-18=7-3-18=-14$

f(-1)=-14

Answer 2

To find the value of the function f(x) at a specific point, you simply need to substitute the given value of x into the function and evaluate it. In this case, we want to find f(-1), so we'll substitute -1 for x in the function f(x) and compute the result:

f(x) = 7x^2 + 3x - 18

f(-1) = 7(-1)^2 + 3(-1) - 18 = 7(1) - 3 - 18 = 7 - 3 - 18 = 4 - 18 = -14

Therefore, f(-1) = -14.