how to solve quadratic equation ax^2+bx+c=0
Use the quadratic formula, which is
x = [-b ±√(b^2 – 4ac)]/(2a)
Example: Solve the quadratic equation: 3x^2 - 7x - 9
Here we have a = 3, b = -7, c = -9.
Substituting for a, b and c in the quadratic formula,
x = [7 ±√((-7)^2 – 4(3)(-9))]/(2(3))
x = [7 ±√(49 + 108)]/(6)
x = [7 ±√(157)]/6
The two solutions are: x1 = [7 + √(157)]/6, x2 = [7 - √(157)]/6