exam Maths Puzzle Numerical Ability

I need to determine if the given x-value is a zero of the function - show work

f(x)=x^3+5x^2+2x-8
Is x=-2 a root
HELP PLEASE
LLO

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If angle RMK=5x+8, angle KMT=3x-5, and angle TML=6x+17, then x=_______
a. 10
b. 4
c. 5
d. 12