Question

Determine a e b
para que a igualdade

[a+b b3]=[2a 27]
[10 7 ] [10 7]​

Answer 1

$\begin{bmatrix}\sf a+b&\sf b^3\\\sf10&\sf7\end{bmatrix}=\begin{bmatrix}\sf2a&\sf27\\\sf10&\sf7\end{bmatrix}$

$\begin{cases}\sf a+b=2a\\\sf b^3=27\end{cases}\\\sf b=\sqrt[\sf3]{\sf27}\\\sf b=3\\\sf 2a=a+b\\\sf 2a-a=b\\\sf a=b\\\sf a=3$