exam Maths Puzzle Numerical Ability

Do the subtraction.
(8x^3y^5+5xy-8y^3) - (4x^3y^5-8xy+4y^3)

My answer is 4x^3y^5 +13xy-12y^3

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exam Other Question

rema is older than ken. the difference of their ages is 12 and the sum of their ages is 50. find the age of each Can you help me factor 25a^2-16 please thanks