Question

9x^2-30x+25-4y^2factorise​

Answer 1

Answer:

(3x-5+2y)(3x-5-2y)

Step-by-step explanation:

Given 9x²-30x+25-4y²

= (9x²-30x+25)-4y²

= [(3x)²-2×3x×5+5²]-4y²

= (3x-5)²-(2y)²

/* By algebraic identity:

1. a²-2ab+b² = (a-b)²

2. a²-b² = (a+b)(a-b) */

= [(3x-5)+2y][(3x-5)-2y]

= (3x-5+2y)(3x-5-2y)

Or

= (3x+2y-5)(3x-2y-5)

Therefore,

9x²-30x+25-4y²

= (3x-5+2y)(3x-5-2y)

•••♪

Answer 2

Step-by-step explanation:

mark as brainlist answer