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Can you guys help me with a quadratic equation?
Equation;
0 = R1^2 - 200R1 - 75000
I want to know the value of R1
Applying my shitty likely wrong formula;
R1 = -200-√(-200^2) -4 (1) x (75000) / 2 (1)
I get syntax error...anyone know where I'm going wrong?
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>>8845704
https://en.wikipedia.org/wiki/Quadratic_formula
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>>8845708
wow very educational, wish I was as smart as you bro...Obviously I have tried to work it out but i'm lost
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a = 1
b = -200
c = -7500
Try the formula again. What do you mean, a syntax error? An error from what?
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>>8845711
http://wolframalpha.com/
>>
lmao this brainlet
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>>8845714
ax^2 - bx - c = 0
R1^2 - 200R1 - 75000 = 0
a=1
b= -200
c= 75000
x = -200 + √ -200^2 - 4 (75000) / 2(1)
Using a calculator for that equation I get an error. Can I not do a quadratic equation on a calculator like this, am I meant to do it mentally?
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>>8845704
How old are you?
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>>8845733
Check the third coefficient again. It's negative: -75000.
What error are you getting? I do not believe this is meant to be solved mentally.
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>>8845733
The formula template is ax^2 + bx + c = 0. Pluses, not minuses. If you see minuses in the problem, then the coefficient is negative.
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>>8845733
Inside the square root you have 40,000 - 300,000 = - 260,000
You're getting errors from you basic calculator because they don't include complex numbers. I'm guessing you haven't learnt about imaginary numbers?
Basically take the sqrt(-1) out and call it i. So your answer will be
-200+-sqrt(260,000)i / 2
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>>8845714
He just typed it in wrong, missed a bracket or something.
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>>8845704
>0 = R1^2 - 200R1 - 75000
Damn, I wish I had basic math ski--
>https://www.symbolab.com/solver/step-by-step/0%20%3D%20R%5E%7B2%7D%20-%20200R%20-%2075000
also your equation is all jaked up.
r = [200 - sqrt(200^2 - (4)(1)(-7500)]/2
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>>8845749
The inside of the radical is not negative.
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>>8845733
It should be
x = ( 200 ± √((-200)^2 - 4 * 1 * -75000)) / (2 * 1)
>>
>>
Can I simplify;
x = (-(-200) ± √((-200)2 - 4(1)(-75000)) ) / (2(1))
to;
x = (200 ± √(40000 + 4(75000)) ) / 2 ?
Does -200^2 (in this case) simplify to 40000?
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gee you guys were a lot of help. If any of you want to know the answer...x = 100 + 50√(34)
x ≅ 391.548 Ohms
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