Question

Factorize the following:
9x²y + 3axy

Answer 1

$$\text{ The greatest common factor of the terms }9x^{2}y\text{ and }3axy\text{ of the expression }9x^{2}y+3axy\text{ is }3xy.$$
$$\text{ Also, we can write }9x^{2}y=3xy\times 3x\text{ and }3axy=3xy\times a.$$
$$\therefore 9x^{2}y+3axy=3xy\times 3x+3xy\times a$$
$$=3xy(3x+a)$$