If 7u - 6v = 30 and uv = 5, find the value of 49u^2 + 36v^2
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(7u-6v)²=(30)².
49u²+36v²-84uv=900
given uv=5
49u²+36v²-84(5)=900
49u²+36v²-420=900
49u²+36v²=900+420
49u²+36v²=1320
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