Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

Simplify $x^4 - 15x^3 +15x^2 -15x + 40$; given x = 14.

Options:

0

40

14

26

Correct Answer:

26

Explanation:

$x^4 - 15x^3 +15x^2 -15x + 40$

given x = 14

= (14)4 - 15 × (14)3 + 15×(14)2 - 15×14 + 40

= (14)4 - (14 + 1) × (14)3 + (14 + 1)(14)2 - (14 + 1) 14 + 40

= (14)4 - (14)4 - (14)3 + 143  + (14)2 - 142 - 14 + 40

26