Question

Let g(x) = 2x2 - 11x. Find g(-1).

Answer 1

Answer:
`g(-1) = 13`

Explanation:

The given function :
`g(x) = 2x^2 - 11x`

To find : g(-1)

i.e . To find the value of g(x) at x= -1.

For that we substitute x = -1 in the given function , then we have

`g(-1) = 2(-1)^2 - 11(-1)`

`\Rightarrow\ g(-1) = 2(-1*-1) + 11\ \ [\because (-)(-)=(+)]`
`\Rightarrow\ g(-1) = 2(1) + 11`

`\Rightarrow\ g(-1) = 2+ 11`

`\Rightarrow\ g(-1) = 13`

Therefore , the value of
`g(-1) = 13` .

Answer 2

g(x) = 2x^2 - 11x
g(-1) = 2(-1)^2 - 11(-1)
g(-1) = 2(1) - (-11)
g(-1) =2 + 11 = 13