Asked by Anonymous
how many solutions are there to the equation -0.2x^+12x+11=0
Answers
Answered by
Reiny
are you still working on that problem?
http://www.jiskha.com/display.cgi?id=1239629281
since the parabola opens downwards and the vertex is above the x-axis there will be 2 real solutions for the equation.
Hint: Divide each term by -.2 to get
x^2 - 60x - 55 = 0
x^2 - 60x + ____ = 55
x^2 - 60x + 900 = 55 + 900
(x-30)^2 = 955
x = 30 ± √955
http://www.jiskha.com/display.cgi?id=1239629281
since the parabola opens downwards and the vertex is above the x-axis there will be 2 real solutions for the equation.
Hint: Divide each term by -.2 to get
x^2 - 60x - 55 = 0
x^2 - 60x + ____ = 55
x^2 - 60x + 900 = 55 + 900
(x-30)^2 = 955
x = 30 ± √955
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