exam Maths Puzzle Numerical Ability

(x+y)^-1/(x-y)^-1

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exam Other Question

Dear tutors,

Simplify y^3*y^2*y^4

Does it equal

A.)y^9

B.)y^24

C.)24y^4

D.)2y^7 Thanks so much! Factor the given polynomial
5q^2r � 45qr + 90r