Question

How do you evaluate the expression 9x + 5 + x + 8 if x= 7?

Answer 1

See a solution process below:

Explanation:

To evaluate the expression when `x = 7` you substitute `color(red)(7)` for each occurrence of `color(red)(x)` in the expression and then execute the operations:

`9color(red)(x) + 5 + color(red)(x) + 8` become:

`(9 * color(red)(7)) + 5 + color(red)(7) + 8 =>`

`63 + 5 + color(red)(7) + 8 =>`

`68 + color(red)(7) + 8 =>`

`75 + 8 =>`

`83`