Question

Tìm x biết :

\(\left(3x-4\right).\left(2x+1\right)-\left(6x+5\right).\left(x-3\right)=3\)

GIÚP MÌNH VỚI =((

Answer 1

(3x−4).(2x+1)−(6x+5).(x−3)=3

6x²+3x-8x-4-6x²+18x-5x+15=3

                                 8x+11=3

                                       8x=3-11

                                      8x=-8

                                       x=-8:8

                                        x=-1

Answer 2

\(\left(3x-4\right).\left(2x+1\right)-\left(6x+5\right).\left(x-3\right)=3\)

\(\Leftrightarrow6x^2+3x-8x-4-6x^2-18x+5x-15=3\)

\(\Leftrightarrow-18x-19=3\)

\(\Leftrightarrow-18x=-16\)

\(\Leftrightarrow x=\frac{8}{9}\)

Answer 3

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Answer 4

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Answer 5

( 3x - 4 )( 2x + 1 ) - ( 6x + 5 )( x - 3 ) = 3

<=> 6x² - 5x - 4 - ( 6x² - 13x - 15 ) = 3

<=> 6x² - 5x - 4 - 6x² + 13x + 15 = 3

<=> 8x + 11 = 3

<=> 8x = -8

<=> x = -1

Answer 6

\(\left(3x-4\right)\left(2x+1\right)-\left(6x+5\right)\left(x-3\right)=3\)

\(\Leftrightarrow6x^2+3x-8x-4-\left(6x^2-18x+5x-15\right)=3\)

\(\Leftrightarrow6x^2-5x-4-\left(6x^2-12x-15\right)=3\)

\(\Leftrightarrow8x+11=3\Leftrightarrow x=-1\)