Question

[Mina]

Tìm x:

a) (x + 2) (x - 4) - x² = 36

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

c) x(x - 10) - x + 10 = 0

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(\Leftrightarrow x^2-2x-8-x^2=36\)

=>-2x=44

hay x=-22

b: \(\Leftrightarrow4x^2+x-8x-2-4x^2-27x=1\)

=>-34x=3

hay x=-3/34

c: =>(x-10)(x-1)=0

=>x=10 hoặc x=1