Question

if f(x)=2x²-1, then f(-3)
​

Answer 1

Answer: $f(-13)=17$

Step-by-step explanation:

$f(x)=2x^2-1$

To find $f(-3)$ replace x for -3

$f(-3)=2(-3)^2-1\\f(-3)=2(9)-1\\f(-3)=18-1\\f(-13)=17$

Answer 2

Answer:

17

Step-by-step explanation:

So you would replace x with -3

2(-3)^2-1

first you would do the exponet

2(9)-1

then you would distribute the 2

18-1

then subtract

17