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Find the discriminant and state the nature the roots: 3x^2-5x+3=0

First person to show the work and answer i'll mark best answer

thanks

2007-09-05 16:31:48 · 6 answers · asked by Dean 1 in Science & Mathematics Mathematics

I already have chosen the best answer..I just now have to wait for the time limit..Thanks anyways

2007-09-05 17:01:22 · update #1

6 answers

for a quadratic equation in the form:
ax^2+bx+c=0
the roots are given by
x = [-b +/- sqrt(b^2-4ac)]/(2a)

the discriminant is b^2-4ac

for the case at hand, this evaluates to
(-5)^2-4(3)(3) = 25-36 = -9

because this is negative, the roots will
be complex conjugates

2007-09-05 16:38:09 · answer #1 · answered by Anonymous · 1 0

The discriminant is the sqrt(b2-4ac) term in the general solution to the quadratic equation.

Here, the value is sqrt(25-4*3*3) or sqrt(-11)
The negative term indicates that the roots are imaginary.

2007-09-05 16:38:35 · answer #2 · answered by cattbarf 7 · 0 0

The quadratic formula is x={-b++/-rt(b^2-4ac)}/2a
a=coordinate of x^2 term in this case+3
b=coordinate of x term, in this case-5
c=constant term, in this case +3
The term b^2-4ac in the formula is called the
DISCRIMINANT, because it identifies at the outset what kind of an answer to expect.
IF b^2-4ac is positive, you will have two real unequal roots. (you add and subtract to the -b term)
If b^2-4ac is 0, then you have two real equal roots.
(both roots will be the same real number)
If b^2-4ac is negative, then you are scuppered. You cannot take the square root of a negative number and get an answer in the Real number system. In this case, we say there is no solution. No real roots.

Now, for your question.
b^2-4ac has a value (-5)^2-4(3)(3),=25-36,=-11
Bad news .There are no real roots.
As my mother used to say, "Semper in Excretum"

2007-09-05 16:53:56 · answer #3 · answered by Grampedo 7 · 0 0

discriminant = (--5)^2 -- 4*(3)*(3) = -- 11
negative discriminant gives roots are imaginary and unequal.

2007-09-05 16:42:13 · answer #4 · answered by sv 7 · 0 0

(-5)² - 4(3)(3)

25 - 36

discriminant = -9

in most cases, no solution

or, 3i if you have learned about imaginary numbers

2007-09-05 16:38:03 · answer #5 · answered by Anonymous · 0 0

try ...www.algebrahelp.com.....it helped me

2007-09-05 16:37:34 · answer #6 · answered by ? 2 · 0 0

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