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12 questions from this quiz
2
Zero
Multiply to ccc, add to bbb
Zero product property
(x+9)(x−1)(x+9)(x-1)(x+9)(x−1)
x=−9x=-9x=−9 and x=1x=1x=1
Difference of two squares
When there's no constant term
Take the square root
Two
Because (−10)2=100(-10)^2 = 100(−10)2=100 too
Expand the brackets
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