mathematics
posted by Mary .
How do i caluclate the roots of the equation for:
x^23x12=0
(x^24)=0 (x+3)=0
x^2=4 x+3+0
x=4 x=3
Am i on the right path or just way off??

I am assuming there is only the one equation
x^2  3x  12 = 0, because what follows makes no sense
First of all your quadratic does not factor, so you will have to either use the quadratic equation formula or complete the square.
let's use the formula:
x = (3 ± √(94(1)(12))/2
= (3 ± √57)/2
Use your calculator if you need a decimal equivalent. 
Ok i may be dense but i don't ge tthe formula cause when i work out
3 } ã(94(1)(12))/2
I get 60 not 57, and i don't understand how you got 9 or 4 either 
for any quadratic equation
ax^2 + bx + c = 0
x = (b ± √(b^2  4ac))/(2a)
so in our case
a = 1, b = 3, and c = 12
look at the second example on this page
http://www.nipissingu.ca/calculus/tutorials/quadratics.html
Respond to this Question
Similar Questions

gce further mathematics
The roots of the equation x^4  3x^2 + 5x  2 = 0 are a, b, c, d. By the relation y=x^2, or otherwise, show that a^2, b^2, c^2, d^2 are the roots of the equation y^4  6y^3 + 5y^2  13y + 4 = 0. Let y = x^2 and substitute that into … 
maths
Show that the equation (1) divided by (x+1)  (x)divided by (x2)=0 has no real roots Well, to begin, start with 1/(x+1x). The x's cancel out because they are opposite signs, so now you have 1/1, or just 1. Then, you are dividing … 
Calculus
relative extrema x^42x^2+5 so far I know how to find the derivative which is 4x^32x now I am stuck... Please help Huh? 
Math
3 times the square root of 3. Would I be right in saying that just writing it with the square root form is right? 
Algebra
The equation x^2+px+q=0, q cannot be equal to 0, has two unequal roots such that the squares of the roots are the same as the two roots. Calculate the product pq. I think the obvious root would be one but the second roots i just can't … 
Algebra
I need help, my teacher says that I'm half way right with this but not fully what am I missing I'm confused. The criteria for the quadratic equation as i written is: y>0 is real roots y=0 is real and equal roots y<0 is imaginary … 
mathematics
Use the discriminant to determine the number of real roots the equation has. 3x2 – 5x + 1 =0 A. One real root (a double root) B. Two distinct real roots C. Three real roots D. None (two imaginary roots) 
eNGlish
What do the dust tracks in the title symbolize? 
Math
determine the value(s) of k which the equation x^2+kx+9=0 will have a) two real roots b) 2 distinct roots I tried to find the discriminant but I didn't get the right answer. 
Math
determine the value(s) of k which a quadratic equation x^2+kx+9=0 will have. a) two equal real roots b) 2 distinct roots I tried to find the discriminant but couldn't get the right answer