Question

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

Answer 1

`(-9+-sqrt(81-4(10)(-1)))/20`

Explanation:

The equation given is in `ax^2+bx+c` form. The general form for the quadratic formula of an unfactorable equation is:
`(-b+-sqrt(b^2-4(a)(c)))/(2a)`
just take the terms and plug them in, you should get the correct answer.

Answer 2

`x=(-9+-sqrt(9^2-4(10)(-1)))/(2(10))`

Explanation:

The Quadratic Formula is `x=(-b+-sqrt(b^2-4ac))/(2a)`

The equation `10x^2+9x-1` is in standard form, which is `ax^2+bx+c`. We can replace the letters in the quadratic formula with the letters from the equation.

`x=(-9+-sqrt(9^2-4(10)(-1)))/(2(10))`