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13 cards from this deck
Equation where highest power of variable is 2
ax2+bx+c=0ax^2 + bx + c = 0ax2+bx+c=0 where a≠0a \neq 0a=0
Factorise the left-hand side
Set each factor equal to zero
Solve the two linear equations
If two factors multiply to zero, one must be zero
Two solutions
Multiply to constant term, add to coefficient of xxx
When there is no constant term in the equation
x2−a2=(x−a)(x+a)x^2 - a^2 = (x-a)(x+a)x2−a2=(x−a)(x+a)
Add constant to both sides, then take square root
Both positive and negative squared give same result
Expand the brackets
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