Using the suitable identities,evaluate the following b)7¹-3² – InterviewSolution

1.	Using the suitable identities,evaluate the following b)7¹-3²
Answer» -STEP explanation:GIVEN, 71 ²i.e. 71 ² =(70+1) ²We KNOW,(x+y) ² =x² +y² +2xy.Then,71 ²=(70+1)² =70 ²+(2×70×1)+1² =4900+140+1=5040+1=5041.Hence, 71² =5041.This is an example!!!

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