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Example x(squared)+6x+9 factors is (x+3)(x+3) x+3=0 X(sub1)=-3 x+3 X(sub2)=-3    
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1. x²+4x+4=0
(x+2)(x+2) or (x+2)²
2. x²+4x-21=0
3. 9x²-16=0
4. 2x²-10x=0
5. 2x²-6x-8=0
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