Question

25(x+y)2-36(x-2y)2 can be factorised as______

Answer 1

Step-by-step explanation:

25[x+y]^2 - 36[x-2y]^2

a^2 - b^2 = [a+b][a-b]

let a = 5[x+y]   b = 6[x-2y]

{5[x+y] + 6[x-2y]}{5[x+y] - 6[x-2y]}

{11x - 7y}{17y - x}

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