find the squares of the following numbers using the identity(a-b)^2=a^2-2ab+b^2:-a)67 b)998 c)395
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a) 67^2 =(70-3)^2 = 70^2 +3^2 -2*70*3 =4900+9-420=4909-420=4489.
b)998^2=(1000-2)^2. (same way)
c) 395^2=(400-5)^2. (same way)
b)998^2=(1000-2)^2. (same way)
c) 395^2=(400-5)^2. (same way)
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