If 4x - 3y = 18 and xy = 10, then find 16x^2 + 9y^2
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Answered by
6
Answer:
564
Step-by-step explanation:
4x-3y =18
Squaring both sides
16x^2 + 9y^2 - 24xy = 324
16x^2 +9y^2 - 24*10 = 324 (because xy=10)
16x^2 + 9y^2 = 324+240 = 564
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