Question

phân tích thành nhân tử

25-4x^2 + (2x + 7)( 5- 2x)

Answer 1

25 - 4x² + (2x+7)(5-2x) = (5-2x)(5+2x) + (2x+7)(5-2x)

= (5-2x)(5+2x+2x+7)

= (5-2x)(12+4x)

____________________JK~ Liên Quân Group ______________________

Answer 2

25 - 4x² + (2x +7)(5 - 2x)

= 5² - (2x)² + (2x+7)(5- 2x)

= (5 - 2x)(5 + 2x) + (2x + 7)(5 - 2x)

= (5 - 2x)(5+ 2x + 2x+7)

= (5- 2x)(4x + 12) = 4(5 - 2x)(x+3)

Answer 3

\(25-4x^2+\left(2x+7\right)\left(5-2x\right)=5^2-\left(2x\right)^2+\left(2x+7\right)\left(5-2x\right)=\left(5-2x\right)\left(5+2x\right)+\left(2x+7\right)\left(5-2x\right)=\left(5-2x\right)\left(5+2x+2x+7\right)=\left(5-2x\right)\left(4x+12\right)\)