Question

What are the exact solutions of x2 − 3x − 1 = 0?

a. x = the quantity of negative 3 plus or minus the square root of 13 all over 2
b. x = the quantity of 3 plus or minus the square root of 13 all over 2
c. x = the quantity of negative 3 plus or minus the square root of 5 all over 2
d. x = the quantity of 3 plus or minus the square root of 5 all over 2

Answer 1

@iGreen

Answer 2

the general form for a quadratic equation is

\[ax ^{2}+bx+c=0\]

in your case you have

\[1x ^{2}-3x-1=0\]

so
a=1
b=-3
c=-1

use the quadratic equation formula to get the 2 solutions:

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

Answer 3

so what is the answer?

Answer 4

No waay

You have all oyu need above to work it out for yourself

Follow the following steps

Calculate
4ac
-4ac
b^2
b^2-4ac
-b
2a

Slot those answers into the equation and the correct answer will be apparent.

Do NOT ask me for the answer - I can do it in my head - but htat doesn't help you.

Just a little effort and you can do it yourself.. :-)

Answer 5

ok thanks

Answer 6

If you want to post your intermediate workings I'll help you along..

Do the 6 steps above and post them here..