Solving Quadratic Equations (-b Formula) (Leaving Cert Mathematics): Quizzes

To find $x$ in quadratic equations

$a=2, b=-7, c=3$

Identify $a$, $b$, $c$

$b^2 - 4ac$

Two real roots

One real root

Add and subtract $\sqrt{\text{discriminant}}$

$(7+5)/4$ or $(7-5)/4$

To find both roots

$\frac{7 \pm 5}{4}$