Author Topic: ask me stuff  (Read 1511 times)


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If ax*x + bx +c = 0,
then what is x?

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If ax*x + bx +c = 0,
then what is x?


Quote from: Yahoo Answers
ax^2+bx+c=0

Complete the square, start by subtracting c from both sides
ax^2 +bx = -c

Divide by a
x^2 +(b/a)x = -(c/a)

add [(1/2)b/a)]^2 to both sides to produce a perfect square trinomial on the right
x^2 +(b/a)x + (b^2)/(4a^2)= (b^2)/(4a^2) - (c/a)

Factor the left side
(x+(b/(2a)))^2 = (b^2)/(4a^2) -(c/a)

Get a common denominator on the right. (multiply -c/a by 4a/4a)
(x+(b/(2a)))^2 = [b^2-4ac]/(4a^2)

Take square root of both side (remember that square root yields a ± solution)
√((x+(b/(2a)))^2) = ±√([b^2-4ac])/(4a^2))

Simplify (√4a^2 = 2a)
x+(b/2a) = ±√([b^2-4ac])/(2a)

Solve for x
x = -(b/2a) ±√([b^2-4ac])/(2a)
x = [-b±√([b^2-4ac)]/(2a)

is it true you're gay for me
I think you know the answer to that question. Yes.