Question

Factorise y^2-21y+90

Answer 1

${y}^{2} - 15y - 6y + 90 \\ y(y - 15) - 6(y - 15) \\ (y - 15)(y - 6)$
hope you got it
;)

Answer 2

${y}^{2} - 21y + 90 \\ {y}^{2} - 15y - 6y + 90 \\ using \: splitting \: the \: term \: method \\ {y }^{2} - 15y - 6y + 90 \\ y(y - 15) - 6(y - 15) \\ (y - 6)(y - 15)$