factorise 49 a²-25b²
Anonymous:
→ (7a-5b)× (7a+5b)
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Answered by
9
using identity(a+b)(a-b) =a² - b²
=49a² - 25 b²
=(7a + 5b)(7a - 5b)
verification-
(a+b)(a-b) =a²-b²
(7a+5b)(7a-5b)
(7a)² - (5b)²
49a² - 25b²
=49a² - 25 b²
=(7a + 5b)(7a - 5b)
verification-
(a+b)(a-b) =a²-b²
(7a+5b)(7a-5b)
(7a)² - (5b)²
49a² - 25b²
Answered by
6
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