Question

y = x^2 - 3x - 8

What is the value of x if y = 0 ?

Answer 1

subs y= 0
0 = x^2 - 3x - 8
by quadratic formula:
\[x = \frac{ -b \pm \sqrt{b^2 - 4ac} }{ 2a } = \frac{ -(-3) \pm \sqrt{(-3)^1-4(1)(-8)} }{ (2)(1) }\]
^that would be tha values of x when y =0