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12 questions from this quiz
If 2 numbers multiply to 0, at least 1 is 0
Rearrange so equation equals zero
Multiply to ccc, add to bbb
Factor out common factor xxx
a2−b2=(a−b)(a+b)a^2 - b^2 = (a-b)(a+b)a2−b2=(a−b)(a+b)
x=0x = 0x=0 or x=412x = 4\frac{1}{2}x=421
At the solutions of the equation
Two
It doesn't make practical sense
Substitute back into original equation
Common factors
x=7x = 7x=7 or x=−2x = -2x=−2
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