Question

The value of 3x2 + 2x – 7 at x = -3 is

Answer 1

Answer:

Let us substitute x=2 in the given expression 3x2−2x−7 as shown below:

3x2−2x−7=(3×22)−(2×2)−7=(3×4)−4−7=12−11=1

Hence, 3x2−2x−7=1 if x=2.

Answer 2

Answer: 3x2+2x-7

Put x=-2

3(-2)2)+2(-2)-7

3X4+(-4)-7

12-4-7

=8-7

=1