Maths Methods 1
Thursday, 17 April 2014
Squaring a bracket
(x+2)^2
= (x+2)(x+2)
= x^2+2x+2x+4
(x+a)^2 = x^2+2ax+a^2
(x-a)^2 = x^2-2ax-a^2
(x+a)(x-a) = x^2-a^2
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