Recall the quadratic identities
(a) (a+b)^2= a^2+2ab+b^2
therefore (2x+4)^2 =4X^2 +16X + 16
(b) use the identity (a-b)^2= a^2 - 2ab + b^2
therefore b) (3x-5)^2 =9x^2 -30x +25
In (c) use the identity (a-b)(a+b) = a^2-b^2
hence (5x-2)(5x+2) = 25x^2-4^2
joseph rimiru answered the question on September 20, 2017 at 20:29
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