zemerion8 zemerion8

23-02-2021
Mathematics

contestada

17. If x is a real number such that x3 = 729,
then x2 + x = ?
A. 738
B. 732
C. 90
D. 84
E. 12

Respuesta :

rorycampbell0721 rorycampbell0721

23-02-2021

Answer:

C. 90

Step-by-step explanation:

If x^3 = 729, x = 9.

Then, plug that into x^2 + x

9 ^ 2 + 9 = 81 + 9 = 90

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