exam Maths Puzzle Numerical Ability

How do you factor a^2 - 2ab - 15b^2 completly, whats the answer?

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exam Other Question

(30y^4 - 12y^2 - 36y) ÷ (6y) please help me solve this. thank you so much.logs confuse me so much

log(w^2+1)-log(w-2)=1

thank you so much and God bless.