Factorise (4a + 3) \(^2\) – (3a – 2)\(^2\)
- (a + 1)(a + 5)
- (a - 5)(7a - 1)
-
(a + 5)(7a + 1)
- a(7a + 1)
The correct answer is: C
Explanation
[(4a + 3) \(^2\) - (3a - 2)\(^2\) = a\(^2\) - b\(^2\) = (a + b) (a - b)
= [(4a + 3) + (3a - 2)] [(4a + 3) - (3a - 2)]
= [4a + 3 + 3a - 2] [4a + 3 - 3a + 2]
= (7a + 1)(a + 5)
(a + 5) (7a + 1)
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