exam Maths Puzzle Numerical Ability

How do you add ad sutract the polynomials 2a^2+3ab-5b^2 and b^2-ab?

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exam Other Question

Each of the two congruent sides of an isosceles traingle is 8 in. less than twice the base. The perimter of the triangle is 74 in. What is the length of the base? Simplify:

a) (3/4)^-2 +(2/5)^0 -(4/3)^2
b) (x^-1 + y^-2)^-2