- a2
– 81b2 সূত্র : a2 – b2 = (a
+ b) (a – b)
a2 – 81b2
= (a)2 – (9b)2
= (a + 9b) (a – 9b)
Ans : (a + 9b) (a – 9b)
- x2 – 25 সূত্র : a2 – b2 = (a + b) (a – b)
x2 – 25
= (x)2 – (5)2
= (x + 5) (x – 5)
Ans : (x + 5) (x – 5)
- 4x2 – y2 সূত্র : a2 – b2 = (a + b) (a – b)
= (2x)2 – (y)2
= (2x + y) (2x – y)
Ans : (2x + y) (2x – y)
- 49 – a2b2 সূত্র : a2 – b2 = (a + b) (a – b)
49 – a2b2
= (7)2 – (ab)2
= (7 + ab) (7 – ab)
Ans : (7 + ab) (7 – ab)
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