Given f(x)=x^2+4x+7, Solve f(x)=1 (No Real Rational Solutions)

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This video explains what happens when you try to solve an equation by factoring and it is not factorable.
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Thank you for putting the answer there at 2:20. I was just visiting this level so that I could do some quick review and not really watching the whole videos. Constantly reviewing all this Algebra 1 and 2 stuff. Never can keep it all in my head. I want a reference book that only has the high school level math.

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