Question

Tìm x biết: 2x (3x+1) + 3x ( 4 - 2x) = 7

Answer 1

\(2x\left(3x+1\right)+3x\left(4-2x\right)=7\)

\(\Rightarrow6x^2+2x+12x-6x^2=7\)

\(\Rightarrow\left(6x^2-6x^2\right)+\left(2x+12x\right)=7\)

\(\Rightarrow14x=7\)

\(\Rightarrow x=\dfrac{1}{2}\)

Answer 2

ta có:

2x(3x+1)+3x(4-2x)=7

<=>6(x^2)+2x+12x+6(x^2)=7

<=>[6(x^2)-6(x^2)]+(2x+12x)=7

<=>0+[x(2+12)]=7

<=>14x=7

<=>x=1/2

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