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$(a+2b)^2 -(a -2b)^2$ is equal to : |
10ab 6ab 8ab 4ab |
8ab |
(x + y)2 = x2 + y2 + 2xy (x - y)2 = x2 + y2 - 2xy (a + 2b)2 - (a - 2b)2 = a2 + 4b2 + 4ab - (a2 + 4b2 - 4ab) = a2 + 4b2 + 4ab - a2 - 4b2 + 4ab = 8ab |
