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If 2l - 3m = -1 and lm = 20, then the value of 4l2 + 9m is |
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Answer» I think we are to find out 4l^2+9m^2 =[(2l)-(3m)]^2+4*2l*3m =(-1)^2+24*20=481 Formula used a^2+b^2=(a-b)^2+4ab |
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