Question

(d) 25(a + b)? -(a - b) factorise

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Answer 1

Answer:

(5)² (a²–b²)

Step-by-step explanation:

25(a+b)(a–b)

Putting 25 into square & Multiplying (a + b)(a – b)

= (5)² × (a²–ab)(ab–b²)

Now open the bracket except (5)²

= (5)² × a² – ab + ab –b²

By solving a² – ab + ab –b² we get a² – b² because – ab + ab = 0

= (5)² × a² – b²

Now put a² – b² in bracket

= (5)² (a² – b²)

Hope this will help you......