exam Maths Puzzle Numerical Ability

Please help me with this x^2+8x+12

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exam Other Question

i need to be shown the work to get the answer to this problem.

what is the value of this rational expression when x = 3?

x-1
_____

(x+1)(x-5)
Solve each of the system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

Any help is appreciated. Thanks