Question

25x2-9y2 factorise using identities

Answer 1

Answer:

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

Step-by-step explanation:

${25x}^{2} - {9y}^{2} \\ = (5x)^{2} - (3y) ^{2} \\ = (5x + 3y)(5x - 3y)$

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Answer 2

Step-by-step explanation:

25x2-9x2

let 25x2 be a2 and 9b2 be b2

a2-b2=(a+b)×(a-b)

(5x)2-(3x)2=(5x+3x)×(5x-3x)

=(8x)×(2x)

=16x2

=(8x)2