luicd
luicd
13-05-2016
Mathematics
contestada
x^2+4x=7 using the quadratic formula?
Respuesta :
apologiabiology
apologiabiology
13-05-2016
when you have
ax^2+bx+c=0
x=[tex] \frac{-b+/- \sqrt{b^{2}-4ac} }{2a} [/tex]
1x^2+4x=7
minus 7
1x^2+4x-7=0
a=1
b=4
c=-7
sub
x=[tex] \frac{-4+/- \sqrt{4^{2}-4(1)(-7)} }{2(1)} [/tex]
x=[tex] \frac{-4+/- \sqrt{16+28} }{2} [/tex]
x=[tex] \frac{-4+/- \sqrt{44} }{2} [/tex]
x=[tex] \frac{-4+/- 2\sqrt{11} }{2} [/tex]
x=[tex] -2+/- \sqrt{11} [/tex]
x=[tex] -2+ \sqrt{11} [/tex] or [tex] -2- \sqrt{11} [/tex]
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