Evaluate x^2 + 1 when x = 3

Step by step, with the reason for every step · Evaluate expressions · Algebra 1

Step by step

Question: find the value of x² + 1 when x = 3.

x² + 1

x = 3

We put 3 in place of x.

= 3² + 1

Powers come before plus.

Order: ( ) → x² √ → × ÷ → + −

3² means 3 times 3.

3² = 3 × 3 = 9

That is 9.

= 9 + 1

9 plus 1 is 10.

= 10

So x² + 1 is 10 when x = 3.

Let's look back.

First: put the numbers in.

Then: powers.

Last: plus and minus.

Answer

= 10

Try this one yourself, then check:

Find the value of x² + 1

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