Given f(x)=2x^(2)-7x-18, find f(-1) Answer:

Substitute x with -1: To find f(-1), we need to substitute x with -1 in the function f(x) = 2x^2 - 7x - 18.Calculate square of -1: Substitute x with -1: f(-1) = 2(-1)^2 - 7(-1) - 18.Multiply by 2: Calculate the square of -1: (-1)^2 = 1.Multiply -7 by -1: Multiply 2 by the square of -1: 2 * 1 = 2.Add and subtract 18: Multiply -7 by -1: -7 * -1 = 7.Calculate final value: Add the results of the previous steps and subtract 18: f(-1) = 2 + 7 - 18.Subtract 18 from 9: Calculate the final value: f(-1) = 9 - 18.Subtract 18 from 9: f(-1) = -9.

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Given
f(x)=2x^(2)-7x-18, find
f(-1)
Answer:

Given $f(x)=2 x^{2}-7 x-18$ , find $f(-1)$ $\newline$ Answer:

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Math Problems

Algebra 2

Evaluate expression when a complex numbers and a variable term is given

Full solution

Q. Given

f(x)=2 x^{2}-7 x-18

, find

f(-1)

\newline

Answer:

Substitute $x$ with $-1$ : To find $f(-1)$ , we need to substitute $x$ with $-1$ in the function $f(x) = 2x^2 - 7x - 18$ .
Calculate square of $-1$ : Substitute $x$ with $-1$ : $f(-1) = 2(-1)^2 - 7(-1) - 18$ .
Multiply by $2$ : Calculate the square of $-1$ : $(-1)^2 = 1$ .
Multiply $-7$ by $-1$ : Multiply $2$ by the square of $-1$ : $2 \times 1 = 2$ .
Add and subtract $18$ : Multiply $-7$ by $-1$ : $-7 \times -1 = 7$ .
Calculate final value: Add the results of the previous steps and subtract $18$ : $f(-1) = 2 + 7 - 18$ .
Subtract $18$ from $9$ : Calculate the final value: $f(-1) = 9 - 18$ .
Subtract $18$ from $9$ : Calculate the final value: $f(-1) = 9 - 18$ . Subtract $18$ from $9$ : $f(-1) = -9$ .