Find the value of this expression if x = 9.
x2 – 9
x – 7

First Problem: 9

Second Problem: 2

Step-by-step explanation:

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or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

the solution, from the graphing of the two lines, is (3,2), i.e., x = 3, y = 2.