SOLUTION: solve x^2+5x-7 to give the exact solutions and then give approximate solutions to three decimal places. I can not figure it out Would you please help.
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Question 327251: solve x^2+5x-7 to give the exact solutions and then give approximate solutions to three decimal places. I can not figure it out Would you please help.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Just use the quadratic formula.
where 
, 
, and 
\ \pm\ \sqrt{(5)^2\ -\ 4(1)(-7)}}{2(1)})
Do the arithmetic and simplify for the exact answer, then punch your calculator buttons for the numeric approximation. The discriminant is prime, so simplifying the expression is trivial.
John
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