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14 cards from this deck
ax2+bx+c=0ax^2 + bx + c = 0ax2+bx+c=0
x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}x=2a−b±b2−4ac
b2−4acb^2 - 4acb2−4ac
Two different real solutions
One repeated real solution
No real solutions (complex solutions)
Plus or minus; gives two possible solutions
Coefficient of x2x^2x2
Coefficient of xxx
Constant term
a≠0a \neq 0a=0
When factorisation not easy or need exact decimal answers
Identify coefficients aaa, bbb, ccc in standard form
Works for any quadratic equation
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