Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If $\frac{(17)^3-(7)^3}{(17^2+7^2+k)}= 10 $, then what is the value of k?

Options:

102

119

136

85

Correct Answer:

119

Explanation:

a3 - b3 = ( a - b ) ( a2 + b2 + ab )

( a - b ) = \(\frac{a^3 - b^3}{a^2 + b^2 + ab }\)

If $\frac{(17)^3-(7)^3}{(17^2+7^2+k)}= 10 $

On comparing the given equation to the formula written above the value of k = ab

a = 17

b = 7

So, the value of k = 17 × 7 = 119