Question

Using the identity (a+b)(a-b) = a^2–b^2 find the value of (49 X 51)

Answer 1

Answer:

the identity (a+b)(a-b)=a^2-b^2

using this identity,

49×51

=51×49

=(50+1)(50-1)

=50^2-1^2

=2500-1

=2499