math

classic Classic list List threaded Threaded
2 messages Options
mashra mashra
Reply | Threaded
Open this post in threaded view
|

math

Use the quadratic formula to solve the equation: 5x^2+5x−5=0
Proof Proof
Reply | Threaded
Open this post in threaded view
|

Re: math

5x² + 5x - 5 = 0
5(x² + x - 1) = 0   ← factored 5 out
x² + x - 1 = 0   ← divided each side by 5

a = 1, b = 1, and c = -1

      -b ± √(b² - 4ac)
x = -------------------
              2a

      -1 ± √[(1)² - 4(1)(-1)]
x = -----------------------------
                   2(1)

       -1 ± √(1 + 4)
x = ---------------
              2

      -1 ± √5
x = --------
          2


- Proof