Question

How do you graph `f(x) = |2x + 1|`?

Answer 1

See below.

Explanation:

When dealing with absolute values, we need to look at the value in the absolute bars as being both positive and negative. In this example that would be:

`2x + 1 and - (2x + 1)` since `| 2x + 1 | -= | -( 2x + 1 ) |`

So we graph `y = 2x + 1` and `y = -2x - 1`

For range `{ y in RR | y >= 0 }`

See graph:
graph{y = | 2x + 1 | [-3, 2, -0.5, 3]}