CBSE Class 7 Answered
dear expert , this question was asked in the regular test conducted by topperlearning.com
Asked by B Shreya Goud | 15 Dec, 2014, 04:24: PM
Expert Answer
Dear shreyagoud@rediffmail.com
Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
Actual question is:
For what value of a and b, the algebraic expression a3 + b3 - 3ab(a + b) equals 37.
Solution is:
Substituting the values of a and b from each of the given options, we get
(-2)3 + (3)3 - 3 (-2)3(-2 + 3) = -8 + 27 + 18 = 37.
Hence, option (A).
A | a = -2; b = 3 | (Correct) |
B | a = 2; b = -3 | |
C | a = -1; b = 1 | |
D | a = 1; b = -2 |
But without the options it is not possible to find the solution.
Only after referring the options, we can solve the query.
Regards
Topperlearning Team.
Topperlearning Team.
Answered by Vimala Ramamurthy | 15 Dec, 2014, 05:05: PM
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