exam Maths Puzzle Numerical Ability

Find LCM of m^2-4m-5 and m^2+8m+7.

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exam Other Question

Find the value of the polynomial.

-x2 + 3x - 1 when x = 4. Can someone show me how to write the mapping rule that shows the transformation of y=2^x for the equation 1/4(y-5)=2^(x-3)?