Question

Factorize the expression $9-30y+25y^2$. [2 MARKS]

Answer 1

Concept: 1 Mark
Application: 1 Mark

$9-30y+25y^2$

$=25y^2+9-30y$

$=(5y{)}^2-2\times 5y\times 3+(3{)}^2$

$Usingtheidentity(a{)}^2-2\times a\times b+(b{)}^2$=$(a-b{)}^2$

$=(5y-3{)}^2$