Question

Tìm x biết a) 2x(x-5)-x(3+2x)=26 b) 6x(5x+3)+3x(1-10x)=7

Answer 1

`a.`\(2x\left(x-5\right)-x\left(3+2x\right)=26\)

`=>2x^2-10x-3x-2x^2=26`

`=>-13x=26`

`=>x=-2`

`b.`\(6x\left(5x+3\right)+3x\left(1-10x\right)=7\)

`=>30x^2+18x+3x-30x=7`

`=>21x=7`

`=>x=1/3`

Answer 2

`a, 2x^2 - 10x - 3x - 2x^2 = 26`

`-> -13x = 26`

`-> x = -2`

`b, 30x^2 + 18x + 3x - 30x^2= 7`

`-> 21x = 7`

`-> x = 1/3`