Solve x^2 + 7x +9 = 0 using the quadratic formula

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Given the quadratic equation:

x^2 + 7x + 9 = 0

We need to solve for the roots using the quadratic formula.

Then we know that:

a =1   b= 7    c = 9

The formula for the roots is:

x = (-b +- sqrt(b^2 -4ac) ] / 2a

==> x1=...

Unlock
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial

Given the quadratic equation:

x^2 + 7x + 9 = 0

We need to solve for the roots using the quadratic formula.

Then we know that:

a =1   b= 7    c = 9

The formula for the roots is:

x = (-b +- sqrt(b^2 -4ac) ] / 2a

==> x1= ( -7 + sqrt(49 -4*1*9) / 2

            = (-7 + sqrt(13) / 2

==> x1= (-7/2) + sqrt13 / 2

==> x2= (-7/2) - sqrt13 /2

Approved by eNotes Editorial Team