Question

1. Tìm x biết:

(3x - 4) (x - 2) = 3x(x - 9) - 3

Answer 1

(3x - 4)(x - 2) = 3x(x - 9) - 3

=> 3x² - 10x + 8 = 3x² - 27x - 3

=> 27x - 10x = -3 - 8

=> 17x = -11

=> x = -11/17 

Answer 2

\(\left(3x-4\right)\left(x-2\right)=3x\left(x-9\right)-3\)

\(\Leftrightarrow3x^2-6x-4x+8=3x^2-27x-3\)

\(\Leftrightarrow3x^2-10x+8=3x^2-27x-3\)

\(\Leftrightarrow17x+11=0\)

\(\Leftrightarrow17x=-11\)

\(\Leftrightarrow x=\frac{-11}{17}\)

Answer 3

\(\left(3x-4\right)\left(x-2\right)=3x\left(x-9\right)-3\)

\(\Leftrightarrow3x^2-10x+8=3x^2-27x-3\)

\(\Leftrightarrow27x-10x=-3-8\)

\(\Leftrightarrow x\left(27-10\right)=-11\)

\(\Leftrightarrow17x=-11\Leftrightarrow x=\frac{-11}{17}\)

Answer 4

\(\left(3x-4\right)\left(x-2\right)=3x\left(x-9\right)-3\)

\(\Leftrightarrow3x^2-10x+8=3x^2-27x-3\)

\(\Leftrightarrow17x+11=0\)

\(\Leftrightarrow x=-\frac{11}{17}\)