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in Mathematics by (10.8k points)

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

by (10.8k points)
Dont forget to explain.

1 Answer

+1 vote
by (10.9k points)
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Best 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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