Question

(25x + 20x +16) (5x-4) multiply

Answer 1

Answer:

$= 75 {x}^{2} + 100 {x}^{2} + 80 - 100x - 80x - 64 \\ = 175 {x}^{2} - 180x + 16 \: \: ans...$

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Answer 2

Step-by-step explanation:

In my opinion there is 25x^2 on the place of 25x.So that we can factorize it in the form of (a+b)^2.

(25x^2+20x+16) (5x-4)

By using identity,(a+b)^2= a^2 + 2ab + b^2 .

=[(5x)^2+2X(5x)X4+(4)^2] (5x-4)

= (5x+4)^2 (5x-4)

=(5x+4)(5x+4)(5x-4)

Hope it is correct.