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Expand the following quadratic equations,using any of the quadratic identity: a) (2x+4)^2 b) (3x-5)^2 c) (5x-2)(5x+2)

Expand the following quadratic equations,using any of the quadratic identity: a) (2x+4)^2 b) (3x-5)^2 c) (5x-2)(5x+2)

Answers

joseph
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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