Question

Tìm x biết:

a, 6x(x-3)-2x(3x+1)=-40

b, x²(2x-3)-2x(x² +3x -1)=5-9x²

c,2(x+5)-x² - 5x=0

d, x³-5x² +x-5=0

e, (x-2)(x+1)-(x-1) (x+2)=3

f, 5x(4x+3)-x(20x-3)=36

giúp tớ ạ!

Answer 1

https://i.imgur.com/zsGzAKT.jpg

Answer 2

https://i.imgur.com/88Zm20M.jpg