Q7. If 3x + 2y = 12 and xy = 6, find the value of 9 2 + 4 2
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Answer:
3x+2y=12
Squaring both sides, we get
(3x+2y)^2 = 144
9x^2+4y^2+2×3x×2y=144
9x^2+4y^2=144-12xy
9x^2+4y^2=144-12×6 since xy=6
9x^2+4y^2=144-72=72
Therefore 9x^2+4y^2=72
Step-by-step explanation:
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