Question

solve it mate with steps​

Answer 1

Step-by-step explanation:

The coefficient of x in (x+5) (x-7) is*. 05. 02. 02

Answer 2

Answer:

Step-by-step explanation:

$\begin{bmatrix}x & -5 & -1\end{bmatrix}\begin{bmatrix}1 & 0 & 2\\0 & 2 & 1\\2 & 0 & 3\end{bmatrix}\begin{bmatrix}x\\4\\1\end{bmatrix}=0\\\Rightarrow\begin{bmatrix}x-2 & -10 & 2x-5-3\end{bmatrix}\begin{bmatrix}x\\4\\1\end{bmatrix}=0\Rightarrow\begin{bmatrix}x-2 & -10 & 2x-8\end{bmatrix}\begin{bmatrix}x\\4\\1\end{bmatrix}=0\\\Rightarrow\begin{bmatrix}x^{2}-2x-40+2x-8\end{bmatrix}=0\\\\\Rightarrow\begin{bmatrix}x^{2}-48\end{bmatrix}=0\\x^{2}=48\Rightarrow x=\sqrt{48}$