Question

Using formula of (a-b)^2, find (4.9)^2

Answer 1

Step-by-step explanation:

solution

given formula (a -b)² = a² - 2ab + b²

using tgis formula we wll solve the some

we have

(4.9 )²

we can write

(5 -0.1)²

now apply the formula

we get

(5-0.1)² = 5² - 2 x5 x 0.1 + 0.1x 0.1

= 25 -1 +0.01

= 24 +0.01

= 24.01

Answer 2

Answer:

(a-b)²=a²+b²-2ab

(4.9)²=(5-0.1)²

a=5

b=0.1

=5²+0.1²-2(5)(0.1)

=25+0.1-1

=24.1