Question

(x+7)(3x-15)=0

Answer 1

3x - 15x + 21 - 105 = 0 

-12x - 84 = 0

x = -7

Answer 2

\(\Rightarrow x+7=0\\ \Rightarrow x=-7\)

Answer 3

(x + 7)(3 - 15) = 0

<=> -12(x + 7) = 0

<=> x + 7 = 0

<=> x = 0 - 7

<=> x = -7

Answer 4

(x+7)(3-15)=0

<=>x+7=0

<=>x=-7

Answer 5

\(\left(x+7\right)\left(3x-15\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-7\\x=5\end{matrix}\right.\)