Question

3y²-21y=0
factorización ​

Answer 1

$3 {y}^{2} - 21y = 0 \\ 3y \times (y - 7) = 0 \\ y \times (y - 7) = 0 \\ y = 0 \\ y - 7 = 0 \\ \bf y = 0 \\ \bf \: y = 7$