exam Maths Puzzle Numerical Ability

Perform the indicated operation and reduce to lowest term. This is from a quiz.

4 + 4
_____ _____
a – b b – a







Thank you

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exam Other Question
the quadratic formula is x=-b+(rad)(b^2-4ac)/2a with a line under the +.use it to find the roots of x^2-4x-6=0. please help. how do you multiply (x-3)(3x+1) using the distributive property?