Question

Tìm x:(làm rõ ra từng cái giúp e vs ạ)

 (x - 2)(4x + 1) - 4x(x + 7) = 1

Answer 1

\(\Leftrightarrow4x^2+x-8x-2-4x^2-27x=1\)

=>-34x=3

hay x=-3/34

Answer 2

\(\left(x-2\right)\left(4x+1\right)-4x\left(x+7\right)=1\\ \Rightarrow4x^2-8x+x-2-4x^2-28x=1\\ \Rightarrow-35x=3\\ \Rightarrow x=\dfrac{-3}{35}\)

Answer 3

     (x - 2)(4x + 1) - 4x(x+7) = 1

⇔ 4x² + x - 8x - 2 - 4x² - 28x = 1

⇔ - 35x = 3

⇔ x = - 3/35