Question

I need help solving the first expression that isn’t solved and the last one. I did it and got an answer but it said it was not correct.

Answer 1

Given

$x=-3$$x^2=(-3)^2=1\times9=9$

And

$2x^2+3=2\times9+3=18+3=21$

Hence

$x^2=9,2x^2+3=21$