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I'm stuck on this question...I tried completing the square but I got x = -2 + or - the sqroot of 4.5 and the answer is supposed to be x = -2 + or - 0.5xthe sqroot of 26

2007-11-15 05:54:29 · 2 answers · asked by Anonymous in Science & Mathematics Mathematics

2 answers

a=2
b=8
c=-5

You may use half quadratic formula.

x1=(-4-sqrt(26))/2
x2=(-4+sqrt(26))/2

2007-11-15 06:04:37 · answer #1 · answered by iyiogrenci 6 · 0 0

2x^2 +8x-5
here b = 8 , a = 2 and c = - 5
x = [-b + (b^2- 4*a*c)^1/2]/2a or [-b - (b^2- 4*a*c)^ 1/2]/2a
x ={ -8 +[(8^2 - 4*2*(-5)]^1/2}/2*2 or

x ={ -8 -[(8^2 - 4*2*(-5)]^1/2}/2*2

x = [-8 +(64+40)^1/2]/4 or [-8 -(64+40)^1/2]/4
x = [ -8 + (104)^1/2]/4 or [ -8 - (104)^1/2]/4
x = [-8 + 2*(26)^1/2]/4 or [-8 + 2*(26)^1/2]/4
x = -2 + [(26)^1/2]/2 or x = -2 - [(26)^1/2]/2

2007-11-15 14:21:21 · answer #2 · answered by finelearner 2 · 0 0

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