(i) (3x – 1/2x)2
(ii) (1/2 x – 3/2 y)2
Answer :
(i) (3x – 1/2x)2
It can be written as
= (3x)2 – 2 × 3x × 1/2x + (1/2x)2
So we get
= 9x2 – 3 + 1/4x2
= 9x2 + 1/4x2 – 3
(ii) (1/2 x – 3/2 y)2
It can be written as
= (1/2 x)2 + (3/2 y)2 – 2 × ½ x × 3/2 y
So we get
= ¼ x2 + 9/4 y2 – 3/2 xy
= ¼ x2 – 3/2 xy + 9/4 y2
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