exam Maths Puzzle Numerical Ability

3x - 5y = 8
3x - 5y = 12

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exam Other Question

Given f(x) = -x^3+3x^2+x+7
find f(-3), f(0), and f(1) I did the problem but it seems to be missing the -3 what did I do wrong?

x=-3
x=-2
-x^2-5x-6

2(2)^2-5(-2)+1
2(6)-5(-2)+1
=12-5-(-2)+1
=12-5--1
=8