it means you multiply the number or variable by it self three times.
For example,
43 = 4*4*4 = 64
53 = 5*5*5 = 125
x3 = x*x*x
3x3 = 3*x*x*x
(3x)3 = 3x*3x*3x= 27x3
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(x + 5)3
What does it mean to simplify an algebraic expression?It means to take the problem to the lowest point you can take it to.
x3 + 4x
An algebraic expression is a collection of terms with no equality sign
An expression is a collection of algebraic terms that does not include an equality sign