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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
Values of xxx that make the equation true
Rearrange to standard form ax2+bx+c=0ax^2 + bx + c = 0ax2+bx+c=0
Factorise the quadratic expression
Apply the null factor theorem
If mn=0mn = 0mn=0, then m=0m = 0m=0 or n=0n = 0n=0 (or both)
The theorem only works when one side equals zero
Two (though they may be the same)
Two numbers that multiply to ccc and add to bbb
Substitute back into the original equation
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