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10 cards from this deck
2
ax2+bx+c=0ax^2 + bx + c = 0ax2+bx+c=0
Equation becomes linear (first degree), not quadratic
Factorising, completing the square, quadratic formula
If (A)(B)=0(A)(B) = 0(A)(B)=0, then either A=0A = 0A=0 or B=0B = 0B=0
x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}x=2a−b±b2−4ac
When quadratic can be easily factored (quickest method)
When factorising not possible or need decimal approximations
Need vertex form or exact answer when factorising is difficult
Substitute known root into equation and solve for unknown
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