Question

If f(x) = 2x2 − 30, find f(4). 35 −14 2 17

Answer 1

Just replace x = 4

2x^2 - 30

=2 *(4)^2 -30

= 2 * 16 - 30

= 32 - 30

= 2

Answer is 2

Answer 2

Answer:  The correct option is (C) 2.

Step-by-step explanation:  We are given the following function :

$f(x)=2x^2-30~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(I)$

We are to find the value of f(4).

To find the required value, we must substitute x = 4 in equation (i),

Therefore, from equation (i), we get

$f(4)\\\\=2\times4^2-30\\\\=2\times16-30\\\\=32-30\\\\=2.$

Thus, teh required value of f(4) is 2.

Option (C) is CORRECT.