Question

Which shows 60^2 − 40^2 being evaluated using the difference of squares method?

Answer 1

D. The answer has to be 2,000, eliminating A and C. B doesn't even use the original equation, as well as incorrectly solving the method, so D is the correct answer, even if you don't understand the principles.

Answer 2

Answer:

Option D - $60^2-40^2=(60+40)(60-40)=(100)(20)=2000$

Step-by-step explanation:

Given : Expression  $60^2-40^2$

To find : Which shows expression being evaluated using the difference of squares method?

Solution :

The best method to find the difference of squares method is by using identity,

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

According to question,

a=60 and b=40

$60^2-40^2=(60+40)(60-40)$

$60^2-40^2=(100)(20)$

$60^2-40^2=2000$

Therefore, Option D is correct.