book Maths Puzzle Numerical Ability

(1)

Find the LCM
4y^2-25; 2y^2+9y+10; 2y^2-y-10

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book Other Question

i am trying to figure out the answer to a question regarding a racing engine were rpm x torque / 5250 = hp . i know the the rpm and the hp but i cannot figure out how to get the t a) What is the sum of the roots of the equation ax2(squared)+ bx + c = 0?
b) What is the product of its roots?