Question

(2x+1)(1-2x)+(2x-1)^2=22

Answer 1

\(\left(1+2x\right)\left(1-2x\right)+\left(2x-1\right)^2=22\)

\(\Leftrightarrow1-4x^2+4x^2-4x+1=22\)

\(\Leftrightarrow-4x=20\)

hay x=-5

Answer 2

\(\left(2x+1\right)\left(1-2x\right)+\left(2x-1\right)^2=22\)

\(\Leftrightarrow1-4x^2+4x^2-4x+1=22\)

\(\Leftrightarrow4x=-20\Leftrightarrow x=-5\)

Answer 3

\(\left(2x+1\right)\left(1-2x\right)+\left(2x-1\right)^2=22\)

\(\Leftrightarrow\) 2x(1 - 2x) + 1(1 - 2x) + (4x² - 4x + 1) = 22

\(\Leftrightarrow\) 2x - 4x² + 1 - 2x + 4x² - 4x + 1 - 22 = 0

\(\Leftrightarrow\) -4x - 20 = 0

\(\Leftrightarrow\) -4x = 20

\(\Leftrightarrow\) x=  \(\dfrac{20}{-4}=-5\)

 Chúc bạn học tốt

\(\Leftrightarrow\) x = \(-\dfrac{17}{4}\)