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ladessa [460]
3 years ago
12

Square root of 2x squared - 7 -1=4

Mathematics
2 answers:
Oksana_A [137]3 years ago
8 0
We start with this:

\sqrt{[tex] 2x^{2}-7} [/tex]-1=4

Add 1 to both sides to get:

\sqrt{ 2x^{2}-7}=5

Now, to get rid of that nasty square root, we square both sides:

(\sqrt{2x^{2}-7}) ^{2} = 5^{2}

You're left with this:

2x^{2} -7 = 25

Add 7 to both sides to get:

2x^{2} = 32

Now square root both sides to get rid of the square on 2x:

\sqrt{2x^{2} } = \sqrt{32}

Since 32 isn't a perfect square we're gonna leave it as a square root.
Now divide both sides by 2 and get your answer:

x = \frac{\sqrt{32}} {2}


Snowcat [4.5K]3 years ago
7 0
The answer is probably x=3. I am great at math so it should be the answer!

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