Question

Tìm x, biết

a) 7x^2 – 28 = 0

b)2 phần 3x(x^2-4)=0

c) 2x^2 + 3x –5 = 0
d) 2x(3x – 5) – 5 + 3x = 0

e) (2x – 1)^2 – (2x + 5)(2x – 5) = 18

Answer 1

a: \(\Leftrightarrow\left(x-2\right)\left(x+2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)