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How do you expand cd-ab if the entire expression is in parentheses and squared?
Wiki User
∙ 12y ago
(CD - ab)^2 = (CD - ab)(CD - ab)
= c^2 d^2 - 2abcd + a^2b^2
Try it with say a = 4, b = 3, c = 2 & d = 1:
Then CD = 2 and ab = 12 so CD - ab = -10 and squared = 100
c^2 = 4
d^2 = 1 so c^2d^2 = 4 x 1 = 4
a^2 = 16
b^2 = 9 so a^2b^2 = 16 x 9 =144
2abcd = 48
giving 4 - 48 + 144 = 100. Shazam!
Wiki User
∙ 12y ago
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