factorise: 4bsquare - 81
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Answers
Answered by
1
Answer:
(2b + 9)(2b - 9)
Step-by-step explanation:
= 4b^2 - 81 = (2b)^2 - 9^2 = (2b + 9)(2b - 9)
By, (a + b)(a - b) = a^2 - b^2
=> (2b + 9)(2b - 9)
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Answered by
0
Answer:
(2b+9)(2b-9)
Step-by-step explanation:
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