exam Maths Puzzle Numerical Ability

I am having trouble with this Problem
X+8
________

X^2+4X-5

Determine the values of x where the expression is defined.

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exam Other Question

Angle L and Angle M are complementary angles. Angle N and Angle P are complementary angles. If angle L=y-2, angle M=2x+3, angle N=2x-y, and P=x-1. Find the values of x, y, angle L, angle M, angle N, and angle P. The associative property of multiplication states: For any real numbes x, y, and z,