Question
Expand the following, using suitable identities.
$ (0.9 p-0.5 q)^2 $
$ (0.9 p-0.5 q)^2 $
✓
Answer
$ (0.9 p-0.5 q)^2 $
$ =(0.9 p)^2+(0.5 q)^2-2 \times 0.9 p \times 0.5 q $
$ =0.81 p^2+0.25 q^2-0.9 p q $
$ =(0.9 p)^2+(0.5 q)^2-2 \times 0.9 p \times 0.5 q $
$ =0.81 p^2+0.25 q^2-0.9 p q $
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