Need help

Can any smart robot help me how to find X (with steps)? I feel like this should be really easy but for some reason I don't know how to do it

Attached: Math problem.png (999x488, 11K)

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x = 5sqrt7 and its inverse
1) square both sides so you get 400 = 225 + x^2
2) solve for x

1.()^2 bith sides so the root dissappears on the one side
2. Then u have to substract (15)^2 so that u have only x^2 on one side
3.Then pull the root
4.Then u have 2 answers ( one is positive one is negative)
Enjoy beta fag

You cannot square both sides. That breaks equality. You have the multiply by the entire RHS to remove the radical.

You are fucking retarded. Squaring BOTH sides preserves equality. This a high school problem

20=sqrt(15^2+x^2)
sqrt(x^2)=20-sqrt(15^2)
x=20-15
x=5
no problemo summer childo!

X is just beside the plus sign and under the root

>You cannot square both sides. That breaks equality

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This is false. I already gave the answer

Thanks so much bros.

Squaring an equality is fine. Doing so with an inequality isn't.

They're wrong fren. Check out this post

Sush. Putting x=5 in the original equation prove it's false.

OP, you need to get through high school already.

That solution is wrong, here's the actual step by step:
1) square both sides:
400 = 225 + x^2
2) subtract 225 from both sides
x^2 = 175
3) take the root from both sides
x = sqrt(175)
4) find the square root of 175
sqrt(175) = 5sqrt(7)

Although you can probably leave it in x = sqrt(175) terms.

X^2 = 175 has two solutions though. One positive and its opposite.

I'm pretty sure you can cancel out the exponents/radical because it's taking the square of a square.
That means you have 20 = 15+x
Subtract 15 from both sides
5 = x

Is that right?

Yes that's why I wrote in the original post "the solution is 5sqrt7 and it's inverse". It's a quadratic.

oridjinally based

See for why it doesn't work.

Again the solution set for this equation is
x = {5sqrt7, -5sqrt7}
If you really want to plug it into wolfram to see.

OP here, my book says the answer is 13.229

that's what i got from following the first reply's steps.

Yes, the 5sqrt7 and -5sqrt7 is appx. 13.229 (it's irrational obviously as root 7 is irrational as 7 is prime)

Is this thread ironic shitposting or robots can't even do hs tier maths?

I am quite a bit beyond high school math, fren.

Yeah I get you

originall

x= 13.22875565553 or -25

Where the fuck did you get -25?

It might be hard to believe since you're antisocial and don't talk to others much, but the average person literally cannot solve a problem like OP's image. Congrats on not having a double digit IQ.

>the average person literally cannot solve a problem like OP's image
I don't believe you.

Yes, but practically, to get negative solution of radical, you must use "-" before it.

t. lives among people with university degrees and never interacts with common people

uni degrees? Dude, I'm a fucking NEET. I'm telling you all my highschool classmates, even the dumbest of the dumbest, even the poor roastie whose sister got pregnant at 13 can solve this.

Wait...you're american, have I guessed it?

jesus christ you sheltered spoiled rotten kids really have no idea what life is like outside of your upper class communities do you

Most people on this board are american, yeah. I wouldn't be surprised if people in other countries were better at algebra but I and most others here are using the US as out baseline.

20 could be the square root of 400 or -400, and so because 15 is positive, I had to cancel out the 225 it made along with adding a -400, meaning x squared had to equal -625 or x being- shiiiiiiiiiiit alright, I fucked up

lmao this is so easy, why is there a whole discussion the first guy got it

when will the stupid summerfag children leave

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noob question here, what is the rule when it comes to transposing shit i.e. moving a square root to another side

Proportionality

rense.com//general96/seriouscourses.html

Reminder brainlets are wasting their time and just making money for big education.

20 can not be the square root of -400, it's that -20 can also be the root of 400. The square root of -400 is 20i.