exam Maths Puzzle Numerical Ability

5(x+2)= 2x+16

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exam Other Question

how would i solve this: 2a^2(3a+5) and -4x^3(2x^2-9x)??? do i work in the parentheses 1st??? 9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2)