Question

5x-7=3x-15

Xmu2=16

(2x-1)mu3=-27

Answer 1

b: \(x\in\left\{4;-4\right\}\)

Answer 2

\(a,x^2=16\\ \Rightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\\ b,\left(2x-1\right)^3=-27\\ \Rightarrow\left(2x-1\right)^3=\left(-3\right)^3\\ \Rightarrow2x-1=-3\\ \Rightarrow2x=-2\\ \Rightarrow x=-1\)