(i)
(10-2)
4. Given x + y = 5 and xy = 36, find the value of x2 + y2.
5. Given (2x + 3y) = 14 and xy = 8, find the value of 4x2 +9y2
uring identities
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2
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Vu do toभर के चिकित्सक है और उसके पास चिकीशतक ढह भी आदत हो गया
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Answer:
4.
X² + Y²= (X+Y)²- 2XY as given, x+y= 5
So, = (5)² - 2.36 xy =36
= 25-72 = 47 (ans)
5.
Given (2x + 3y)= 14
squaring both side (2x + 3y)² = 14²
=> 4x² + 9y² + 12xy = 196
=> 4x² + 9y² = 196 - 12.8
=> 4x² + 9y² = 196-96 = 100
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