Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If a + b = 3 and ab = 2 then what is the value of  2a3 +2b3 ?

Options:

25

27

18

20

Correct Answer:

18

Explanation:

If a + b = 3

ab = 2

then what is the value of  2a3 +2b3

Put the values of a = 2 and b = 1

2a3 +2b3 = 2(2)3 +2(1)3

2a3 +2b3 = 16 + 2 = 18