Question

(iii) x2 + (3x - y)(3x + y + y)
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Answer 1

Answer:

$x^2+\left(3x-y\right)\left(3x+y+y\right)\\= x^2+\left(3x-y\right)\left(3x+2y\right)\\= x^2+9x^2+3xy-2y^2\\= 10x^2+3xy-2y^2$

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