1.

If a3 + b3 = 217 and a + b = 7, then the value of ab is:1. -12. 63. -64. 7

Answer» Correct Answer - Option 2 : 6

Given:

a3 + b3 = 217

(a + b) = 7

Formula Used:

(a + b)3 = a3 + b3 + 3ab (a + b)

Calculation:

Substituting the values in the formula

(7)3 = 217 + 3ab (7)

343 – 217 = 21ab

126/21 = ab

∴The value of ab is = 6



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