Question

3. Each of the folowing quadratic equation has two equal roots.Find the values of p.
a)3x^2-px+12
pls help me to check whether my answer and working is correct or not. @ganeshie8

Answer 1

\[x^2-\frac{ p }{ 3 }x+4=0\]

Answer 2

therefore the roots are +-2

Answer 3

\[(2)^2-\frac{ p }{ 3 }(2)+4=0\]

Answer 4

or

Answer 5

\[(-2)^2-\frac{ p }{ 3 }(-2)+4=0\]

Answer 6

therefore, p=+-12

Answer 7

is my answer correct?

Answer 8

If you want the roots to be equal, make the discriminant 0.

Answer 9

\[
(-p)^2-4(3)(12)=0
\]

Answer 10

do you know how to expand?