Question

Factorisation
${9y }^{2} - 30y + 25$
​

Answer 1

Step-by-step explanation:

9y²-30y+25

(3y)²+2×3y×(-5)+(-5)²

(3y-5)²

Answer 2

Answer:

9y²-30y+25

=9y²-15y-15y+25

=(9y²-15y)-(15y+25)

=3y(3y-5)-5(3y-5)

=(3y-5)(3y-5)

=(3y-5)²