Question

1. Factorise the following using proper identities :
i) 25x²y² - 20xy²z + 4y²z²​

Answer 1

Answer:

25x2y2 - 20xy2z + 4y2z2

= (5xy)2 - 2൵ × 2yz + (2yz)2

= (5xy + 2yz)2

= y2 (5x + 2z)2

Answer 2

Answer:

(5xy-2yz)

${(a - b) }^{2} = {a}^{2} - 2ab + {b}^{2}$

25x²y²-20xy ²z+ 4y ² z²

Hear,a²=(5 xy)² ,b²= (2yz) ²

=(5xy-2yz)²