Question

Using Identities, Evaluate the following: (1.)51² - 49² (2). 103 X 104​

Answer 1

Answer:

1)51^2-49^2

=(50+1)^2-(50-1)^2

=(2500+1+100)-(2500+1-100)

=2500+1+100-2500-1+100

=200

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Answer 2

1.51²-49²=(51+49)(51-49)=100(2)=200

2.103*104=(100+3)(100+4)=100²+(4+3)100+12=

10000+700+12=10712

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