1.

If 2l - 3m = -1 and lm = 20, then the value of 4l2 + 9m is

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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