Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

Simplify the following expression.

$32^3 - 3(32^2)(12) + 3(32)(12^3)- 12^3$

Options:

8000

4000

16000

800

Correct Answer:

8000

Explanation:

We know that,

(a - b)3 = a3 - b3 - 3ab(a-b)

$32^3 - 3(32^2)(12) + 3(32)(12^3)- 12^3$

By comparing this given equation with the formula we get the cubic expression given below,

(32 - 12)3 = $32^3 - 3(32^2)(12) + 3(32)(12^3)- 12^3$

a = 32

b = 12

(32 - 12)3 = (20)3 = 8000