Q3 of 90 Page 33

Factorize using appropriate identities.

x2 – 4x + 4

x2 – 4x + 4 = x2 + 2x(2) + (2)2

Using identity: (a + b)2 = a2 + 2ab + b2


⇒ x2 – 4x + 4 = (x + 2)2


⇒ x2 – 4x + 4 = (x + 2)(x + 2)


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