If 3a+5b=11 and ab=2 find the value of 9a^2+25b^2
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9a^2+25b^2
=(3a)^2+(5b)^2
=(3a+5b)^2-(2×3a×5b)
=(11)^2-30×ab
=121-30×2
=121-60
=61
=(3a)^2+(5b)^2
=(3a+5b)^2-(2×3a×5b)
=(11)^2-30×ab
=121-30×2
=121-60
=61
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