EM-419

Quadratic formula

E Math · Secondary 3 · Hard · Quadratic formula

Solve the quadratic equation

2x^2-7x-9=0

using the quadratic formula.

$x=\dfrac{9}{2}$ or $x=-1$
$x=\dfrac{9}{2}$ or $x=1$
$x=\dfrac{7}{4}$ or $x=-\dfrac{11}{4}$
$x=\dfrac{-7\pm11}{2}$

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