3x-4y=16, xy=4, find 9x²+16y²
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Answered by
4
Answer:
Step-by-step explanation:
(3x-4y)^2 =9x^2+16y^2-24xy
16^2=9x^2+16y^2-96
352=9x^2+16y^2
Answered by
9
Answer
(3x - 4y)²= 16²
3x² +4y² - 2( 3x * 4y) = 256
9x² + 16y² - 24xy = 256
9x² + 16y² - 24 * 4 = 256
9x² + 16y² - 96 = 256
9x² + 16y² = 256 +96 = 351
banerjeehritama:
one question, why is 24 multiplied by 4 in 3rd step?
because the value of xy is 4 given in the queation
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