Question

Using the identity Evaluate 18*23 please give me ansqer fast please​

Answer 1

Answer:

=18 * 23

= (20-2) (20 +3)

Here, we will use an identity that is (x+a) (x+b) = x^2 + (a+b)x + a*b

= {20 + (-2)} ( 20 + 3)

= 20^2 + { (-2) + 3} *20 + (-2)*3

=400 + 1*20 +(-6)

=400 + 20 -6

= 420 - 6

= 414