Solve h(x) = 10 - x, h(4)

Step by step, with the reason for every step · Functions · Algebra 2

Step by step

Question: find h(4) for h(x) = 10 − x.

h(x) = 10 − x

h(x) is read "h of x".

It is a rule, called a function.

A number goes in for x.

The rule gives one answer out.

h(x) = "h of x"

x goes in → an answer comes out

h(4) means: put 4 in place of every x.

Every x becomes 4.

h(4) = 10 − 4

10 minus 4 is 6.

h(4) = 6

So h(4) = 6.

Let's look back.

First: put the number in.

Last: take away.

Answer

h(4) = 6

Try this one yourself, then check:

h(x) = 14 − x, find h(4)

Show the answer

h(4) = 10