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If x+y=5 and xy=4 find x-y

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If x+y=5 and xy=4 find x-y

Posted by Shreyansh Mishra 5 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 3 months ago

(x+y)² = x²- 2xy + y²

= x²+ 2xy + y²- 4xy

= (x+y)²- 4xy

= 5² - 4 × 4

= 25 - 16 = 9

∴ x - y = √9

= 3

3Thank You

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CBSE > Class 09 > Mathematics