Question

(5 - 2x) (2x + 7) = 4x² - 25

Answer 1

Tham Khảo

𝑥=52𝑥=−3

Answer 2

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

\(\Rightarrow\left(2x-5\right)\left(-2x-7\right)=\left(2x-5\right)\left(2x+5\right)\)

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

\(\Rightarrow4x=-12\)

\(\Rightarrow x=-3\)

Answer 3

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

`<=>(5-2x)(2x+7)=(2x-5)(2x+5)`

`<=>(5-2x)(2x+7)+(5-2x)(2x+5)=0`

`<=>(5-2x)(2x+7+2x+5)=0`

`<=>(5-2x)(4x+12)=0`

`<=>[(5-2x=0),(4x+12=0):}`

`<=>[(x=5/2),(x=-3):}`