if 2a+3b=10 and ab=5 find 4a2+9b2
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2a + 3b = 10
squaring both side
4a^2 + 9b^2 + 12 ab = 100
4a^2 + 9b^2 = 100- 60 =40
squaring both side
4a^2 + 9b^2 + 12 ab = 100
4a^2 + 9b^2 = 100- 60 =40
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