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13-10-2017
Mathematics

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which equation shows the quadratic formula used correctly to solve 7x^2=9+x?

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Alexis6166 Alexis6166

13-10-2017

7x^2=9+x
minus 9+x both sides
7x^2-1x-9=0

for ax^2+bx+c=0
x=

7x^2-1x-9=0
a=7
b=-1
c=-9

x= is correct usage

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