Solve the expression [8 - (2x3)] +7
Mathematics · College · Tue Nov 03 2020
Answered on
Given the numerical expression:
[8 - (2x^3)] +7
Solution:
In order to solve the numerical equation, we need to solve first the values inside the bracket, but since they do not have any common variable, since only one term has x, we can simply proceed in combining like terms that is outside the bracket.
= [8 - (2x^3)] +7
= 8 - 2x^3 +7
Simplified form: = 15 - 2x^3
If we want to get the value of x, we simply transpose -2x^3 on the other side of the equation. Note that when transposing a number, the sign changes.
5 =2x^3
Divide both sides by 2, then take the cube root of both sides in order to cancel out x^3. Cube root can be represented as n^⅓. This will get the value of x
x^3=5/2
x =(5/2)^⅓