Question

22. Factorise :(5r + 2)^2-(2r – 1)^2.​

Answer 1

Step-by-step explanation:

(5r+2)²-(2r-1)²

[a²-b²=(a+b)(a-b)]

(5r+2+2r-1)(5r+2-2r+1)

(7r+1)(3r+3)

3(7r+1)(r+1)

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