exam Maths Puzzle Numerical Ability

For f(x) = 8x � 9, find f(-3).

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exam Other Question

solve using the square property:
please tell me if I solved this problem correctly.

(x+6)^2=121
x+6=sqrt121
x+6=11
x=6+11
x=17

x-6= -sqrt121
x-6= -11
x=6-11
x= -5

x= 17, -5 find the additive inverse of this polynomonal" 6x^2+x"