Question

using identitities, evalute. 73^2

Answer 1

(70+3)^2=(70)^2+2.70.3+3^2

Answer 2

(70+3)^2 = use identity (a+b)^2=a^2 +b^2+2ab
= (70)^2+(3)^2+2×70×3=4900+9+420=5329