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anonymous
 one year ago
Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.
A.
{–12, 5}
B.
{–11.1, –2.9}
C.
{–5.6, –1.4}
D.
{–3.9, 12.1}
anonymous
 one year ago
Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth. A. {–12, 5} B. {–11.1, –2.9} C. {–5.6, –1.4} D. {–3.9, 12.1}

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1hint: \[\Large x = \frac{{  7 \pm \sqrt {{7^2}  4 \times 1 \times 8} }}{{2 \times 7}}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0For quadratic formulas you have the basic form \[ax^2+bx+c=0\] And than you should determine your determinator which is \[b^24ac\] And then your solutions are \[\frac{ b \pm \sqrt{determinator} }{ 2a }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i need help on the solving dw:1433008252754:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i already had help at the begenning but, the user left off at the following part

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1that's right! So we have: \[\begin{gathered} {x_1} = \frac{{  7 + 4.12}}{{14}} =  0.21 \hfill \\ \hfill \\ {x_2} = \frac{{  7  4.12}}{{14}} =  0.79 \hfill \\ \end{gathered} \]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1oops.. I have made an error, here are the right formulas:

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large \begin{gathered} x = \frac{{  7 \pm \sqrt {{7^2}  4 \times 1 \times 8} }}{2} \hfill \\ {x_1} = \frac{{  7 + 4.12}}{2} =  1.44 \hfill \\ \hfill \\ {x_2} = \frac{{  7  4.12}}{2} =  5.56 \hfill \\ \end{gathered} \]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the answer would be c?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1yes! that's right! Sorry for my previous error
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