Question

how to factorise (x + 2y)² - 1​

Answer 1

Answer:

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a²-b² = (a+b)(a-b)

(x+2y) = a

1 = b

(x+2y+1)(x+2y-1)

Because 1² = 1

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Step-by-step explanation:

Answer 2

Answer:

=x²+4y²+4xy-1

=4y(y+x)+x²-1