Question

x^2-4x-1=0

Answer 1

u need to use qudratic formula to find the roots ..u know ??

Answer 2

yes but we r asked to use discriminant method to slove this

Answer 3

that is we have to use

Answer 4

apply that

Answer 5

the discriminant only tells you how many real roots you have

Answer 6

what kind of roots

Answer 7

\[x=\frac{ -b \pm \sqrt{b^2-4ac}}{ 2a }\]

Answer 8

the discriminant by itself won't tell you want the roots are

Answer 9

the discriminant is the part under the radical sign. b^2 - 4ac

Answer 10

can we solve it by completing square
????/

Answer 11

the discriminant by itself won't tell you what the roots are

Answer 12

yeah u can do that also

Answer 13

the quadratic formula is solved generally by using completing the square

Answer 14

that will also give you the root

Answer 15

its inefficient to complete the square *every* time you solve a quadratic equation

Answer 16

but how??