between a quadratic equation whose roots are - 3 and - 7.
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x=-3 or x=-7
x+3=0 or x+7=0
(x+3)(x+7)=0
x(x+7)+3(x+7)=0
x²+7x+3x+21=0
x²+10x+21=0
Step-by-step explanation:
the equation is x²+10x+21=0
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