Question

using identity is find the value 11.5*10.5

Answer 1

11.5 × 10.5 = (10 + 1.5) (10 + 0.5)

Using identity (x + a) (x + b) = x² +(a+b)x +ab, we get

10² + (1.5 + 0.5)×10 + 1.5×0.5

100 + 20 + 0.75

= 120.75