Question

Can you check this one

Answer 1

Just like the last problem, they want us to plug in -2 where r is, -3 where s is and 5 where t is. Doing that, we get:

$2(-2)^2+3(-3)^3-(-2)^2+4(5)^2-(-2)^2 =\\ 8-81-4+100-4=\\ 19+8-8=19$

Your answer is indeed correct!