(a + b)2 - 4ab is equal to:
(a + b + 2ab) (a + b - 2ab)
(a + b) (a - b)
(a + b) (a + b)
(a - b) (a - b)
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(a + b)2 - 4ab
Using the formula
[∵ (x + y)2 = x2 + y2 + 2xy]
= a2 + b2 + 2ab - 4ab
= a2 + b2 + (2ab - 4ab)
= a2 + b2 - 2ab
= (a)2 + (b)2 - 2 x a x b
= (a - b)2
= (a - b)(a - b)
Hence, option 4 is the correct option.
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Factorise :
2a2b2 - 98b4
a2 - 16b2 - 2a - 8b
a4 + 4a2 - 32 is equal to:
(a2 + 8) (a + 2) (a + 2)
(a2 - 8) (a - 2) (a + 2)
(a2 + 8) (a2 + 4)
(a2 + 8) (a + 2) (a - 2)
36 - 60y + 25y2 is equal to :
(3 + 5y) (3 + 5y)
(3 - 5y) (6 - 5y)
(3 + 4y) (3 - 4y)
none of these