Use the quadratic formula to solve the equation
x^2-7x+9=0
I've tried to do this manytimes but can't seem to get it. I've other questions like it so if someone could talk me through this one maybe i'd understnad the method better thanks.
X^2 - 7X + 9 = 0.
The Quadratic Formula:
X = (-b +- sqrt(b^2-4ac)) / 2a.
X = 7 +- sqrt(49-36)) / 2,
X = (7 +- sqrt(13)) / 2,
X = (7 +- 3.61) / 2,
X = (7 + 3.61) / 2 = 5.31.
X = (7 - 3.61) / 2 = 1.70.
Solution set: X = 5.31, and 1.70.
Or
(5.31,0), (1.70,0).