4. Factorise
(a) a2 -5b2-4ab
(b)27a2 - 48b2
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1
Answer:
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Answered by
7
Answer:
a. a²-4ab-5b²
=a²-5ab+ab-5b²
=a(a-5b)+b(a-5b)
=(a+b)(a-5b)
b. 27a²-48b²
=(3√3a+4√3b)(3√3a-4√3b)
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