Factorise (5a - 3b)^2 - 16b^2
Answers
Answered by
58
a^2-b^2
=(a+b)(a-b)
<(5a-3b)+4b><(5a-3b)-4b>
=(5a-3b+4b)(5a-3b-4b)
=(5a+b)(5a-7b)
=(a+b)(a-b)
<(5a-3b)+4b><(5a-3b)-4b>
=(5a-3b+4b)(5a-3b-4b)
=(5a+b)(5a-7b)
Sandy260:
But when I used the exact steps for the sum (5a+2b)^2 -a^2, I got the answer wrong. Do you why?
your answer correct if you multiply
there is no need of multiply
Answered by
20
(5a_3b)²-16b²
(a-b)²= a²+b²-2ab
(25a²+9b²-30ab)-16b²
25a²+9b²-30ab-16b²
25a²-30ab-7b²
I hope you understand if you want full solutions so please tell me
(a-b)²= a²+b²-2ab
(25a²+9b²-30ab)-16b²
25a²+9b²-30ab-16b²
25a²-30ab-7b²
I hope you understand if you want full solutions so please tell me
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