Question

use the suitable identity to simplify : (11a-7b) (11a+7b)

Answer 1

$<b>Heya mate. (^_-). Solution below.$
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$<u>Question -</u>$

Use suitable identity to simplify : (11a - 7b)(11a + 7b)
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$<u>Solution -</u>$

(11a - 7b)(11a + 7b)

• Using identity -
(x - y)(x + y) = x² - y²

• So let -

11a = x

7b = y


Then,

(x - y)(x + y) = x² - y²


=> (11a - 7b)(11a + 7b)

= [(11a)² - (7b²)]

= 121a² - 49b².

$<marquee>Hence, (11a - 7b)(11a + 7b) = 121a² - 49b².</marquee>$
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Thank you.. ;-)
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