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There are 5 quadratics below. Four of them have two distinct roots each. The other has only one distinct root; find the value of that root.

4x^2+16x-9
2x^2+80x+400
x^2-6x-9
4x^2-12x+9
-x^2+14x+49

2 answers

find the one whose discriminant (b^2-4ac) is zero. That will have a single root. (-b/2a)
10+(7x)=5x-9
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