Question

Express product of 13 x 15 even if number is in form of (a^2-b^2)= (a-b) (a+b)

Answer 1

Answer:

13*15=(14-1)(14+1)=14^2-1^2

Step-by-step explanation:

13*15

Lets say: a-b=13 & a+b=15

Then we can easily solve it and find: a=14, b=1

So the expression is:

13*15=(14-1)(14+1)=14^2-1^2