Evaluate (9th grade algebra 1)
1 answer:
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Here you go!!! I hope this helps
Answer:
16
Step-by-step explanation:
To solve this equation, we need the formula for perfect squares:
or
<em>this is the formula we will use because the signs match the one in the question</em>.
Knowing these, we can set up an equation that assumes that the answer we will end up with is a perfect square.
Work:
- this is the setup for being able to solve for the unknown
, now we need to solve for
(I replaced
with
because I'm setting up this question to be a perfect square).
- multiply the left side. Remember that your answer will not be
, but
.
- Divide like terms and isolate the variable. In this case,
and
are on both sides, so dive them and they will be canceled out.
- divide by
and you will have your value for
- Now we plug
Our final answer is 16.