using identitities, evalute. 73^2
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(70+3)^2=(70)^2+2.70.3+3^2
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(70+3)^2 = use identity (a+b)^2=a^2 +b^2+2ab
= (70)^2+(3)^2+2×70×3=4900+9+420=5329
= (70)^2+(3)^2+2×70×3=4900+9+420=5329
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