Question

[thanh tam tran]

^{tim x biet (2x-3)^2-4.(x+1)^2=5}

Answer 1

[dinhkhachoang]

TA CÓ \(\left(2X-3\right)^2-4.\left(X+1\right)^2=5\)

=>\(\left(2X-3\right)^2-\left(4X+4\right)^2=5\)

=>\(\left(2X-3\right)^2=5;\left(4X+4\right)^2=5\)

=>\(\orbr{\begin{cases}2X-3=5\\4X+4=5\end{cases}}\) =>\(\orbr{\begin{cases}2X=8\\4X=1\end{cases}}\) =>\(\orbr{\begin{cases}X=4\\X=\frac{1}{4}\end{cases}}\)