factorise the following using appropriate identities 4 y ^2- 4 y+ 1
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(2y)²+2*2y*(-1)+(-1)²
(2y-1)²
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Step-by-step explanation:
(using identity 2 :a^2-2ab+b^2)
=4y^2-4y+1
=(2y)^2-2*2y*1+(1)^2
=(2y-1)^2
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