Find out the answer to "How do you evaluate the expression for 2x..." - Plainmath

Secondary
Algebra
Pre-Algebra
Equations, expressions, and inequalitie

Edkowiez2x

Answered question

2022-02-01

How do you evaluate the expression for

2^{x}

if

x = - 2

and if

x = 3

?

Answer & Explanation

Rihanna Lester

Beginner2022-02-02Added 12 answers

Step 1
For each of these you substitute the value for x in the expression.
Solve for

x = - 2

2^{- 2}

We can use this rule for exponents to rewrite this problem:

x^{a} = \frac{1}{x^{- a}}

2^{- 2}

\frac{1}{2^{- - 2}}

\frac{1}{2^{2}}

\frac{1}{4}

Step 2
Solve for

x = 3

2^{3}

2 \times 2 \times 2

= 8

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