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10 cards from this deck
ax2+bx+c=0ax^2 + bx + c = 0ax2+bx+c=0 where a≠0a \neq 0a=0
If a=0a = 0a=0, equation becomes linear, not quadratic
Quadratic where coefficient of x2x^2x2 equals 1
Quadratic where coefficient of x2x^2x2 does not equal 1
If ab=0ab = 0ab=0, then a=0a = 0a=0 or b=0b = 0b=0
Factorisation, completing the square, quadratic formula
Multiply to give ccc and add to give bbb
Divide xxx coefficient by 2, then square the result
x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}x=2a−b±b2−4ac
Two solutions: one using addition, one using subtraction
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