Question

What is the quadratic formula of #0=10x^2 + 9x-1#?

Answer 1

Quadratic formula is:


`x = \frac{- b +/- \sqrt{ b^(2) - 4ac} }{2a}`

Plug in:


`x = \frac{-9 +/- \sqrt{9^(2) - 4(10)(-1)} }{2(10)}`


`x = (-9 +/- √(81 + 40))/(20)`


`x = (- 9 +/- √(121))/(20)`


`x = (- 9 +/- 11)/(20)`


`x = (-9 - 11)/(20)` and
`x = (- 9 + 11)/(20)`


`x = (- 20)/(20)` and
`x = (2)/(20)`


`x = - 1, (1)/(10)`