Posted by Mary on Saturday, June 27, 2009 at 10:56am.
How do i caluclate the roots of the equation for:
Am i on the right path or just way off??
mathematics - Reiny, Saturday, June 27, 2009 at 11:15am
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 ± √(9-4(1)(-12))/2
= (3 ± √57)/2
Use your calculator if you need a decimal equivalent.
Mathematics - Mary, Saturday, June 27, 2009 at 11:54am
Ok i may be dense but i don't ge tthe formula cause when i work out
3 } ã(9-4(1)(-12))/2
I get 60 not 57, and i don't understand how you got 9 or 4 either
mathematics - Reiny, Saturday, June 27, 2009 at 12:03pm
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
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