Question

can someone tell me the correct ans. of this ques.
6.5*6.5-45.5+3.5*3.5 is equals to
1. 10
2. 9
3. 7 
4. 6
is the answer is 10

Answer 1

The ans is 9 I'll show you how 6.5^2 - 2x 6.5x3.5 + 3.5^2 by using identity (a-b)^2 = a^2 -2ab + b^2 we get (6.5 -3.5)^2 = 3^2 =9 Answer