Question

Evaluate 40.7×39.3 in factorisation

Answer 1

Answer:

The answer obtained using factorisation method is 1599.51

Step-by-step explanation:

40.7 × 39.3 can also be written as :

(40 +0.7)(40-0.7)

using a^2 - b^2 = (a+b)(a-b)

40^2 - 0.7^2

1600 - 0.49

=1599.51