Question

factorise 9(x+a)^2-4x^2​

Answer 1

9(x+a)²-4x²

9(x²+a²+2ax)-4x²

9x²+9a²+18ax-4x²

5x²+18ax+9a²

5x²+15ax+3ax+9a²

5x(x+3a)+3a(x+3a)

(5x+3a)(x+3a)

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