Factorise :
2a2b2 - 98b4
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= 2b2(a2 - 49b2)
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= 2b2((a)2 - (7b)2)
= 2b2(a - 7b)(a + 7b)
Hence,2a2b2 - 98b4 = 2b2(a - 7b)(a + 7b)
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x2 + 6xy + 9y2 + x + 3y
4a2 - 12ab + 9b2 + 4a - 6b
a2 - 16b2 - 2a - 8b
(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)