Question

Solve the quadratic equation. 4x2 - 30 = 0
A. ± √15
B. ± √15/√2
C. ± √15 /2
D. ± √30 /2

Answer 1

quadratic formula
\[\frac{ -b \pm \sqrt{b^2-4*a*c} }{ 2a }\]

Answer 2

ax^2+bx+c=0 is where that expression comes from (if that makes sense)