Question

[Good Bro]

Tìm x:

a)x(x+4)+(5+x)(5-x)=3

b)(2x-3)^2=(4x+3)^2

mình cảm ơn

Answer 1

[Nguyễn Hoàng Minh]

\(a,\Rightarrow x^2+4x+25-x^2=3\\ \Rightarrow4x=-22\Rightarrow x=-\dfrac{11}{2}\\ b,\Rightarrow\left(2x-3-4x-3\right)\left(2x-3+4x+3\right)=0\\ \Rightarrow6x\left(-2x-6\right)=0\Rightarrow\left[{}\begin{matrix}x=-3\\x=0\end{matrix}\right.\)