Question

a, 2x(12x-5)-8x(3x-1)=30

b,3x(3-2x)=6x(x-1)=15

Answer 1

\(a,2x\left(12x-5\right)-8x\left(3x-1\right)=30\)

\(\Leftrightarrow24x^2-10x-24x^2+8x=30\)

\(\Leftrightarrow-2x=30\)

\(\Leftrightarrow x=-15\)

\(b,3x\left(3-2x\right)+6x\left(x-1\right)=15\)

\(\Leftrightarrow9x-6x^2+6x^2-6x=15\)

\(\Leftrightarrow3x=15\)

\(\Leftrightarrow x=-5\)

Answer 2

a) \(2x\left(12x-5\right)-8x\left(3x-1\right)=30\)

\(\Leftrightarrow24x^2-10x-24x^2+8x=30\)

\(\Leftrightarrow-10x+8x=30\Leftrightarrow-2x=30\Leftrightarrow x=\dfrac{30}{-2}=-15\)

vậy \(x=-15\)

b) đề có sai o bn

Answer 3

a) đề = 24x^2-10x-24x^2+8x=30

= -10x+8x =30

\(\Rightarrow\)x=-15

b)đề \(\Leftrightarrow\)9x-6x^2=6x^2-6x=15

\(\Leftrightarrow\)9x-6x^2-6x^2+6x=15

\(\Leftrightarrow\)15x=15

\(\Rightarrow\)x=1

Answer 4

a)\(2x\left(12x-5\right)-8x\left(3x-1\right)=30\)

\(24x^2-10x-24x^2+8x=30\)

\(-2x=30\)

\(x=-15\)