SOLUTION: please help me solve this! solve x^2 +7x-4=0

Question 470543: please help me solve this! solve x^2 +7x-4=0
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
x^2 +7x-4=0
Find the roots of the equation by quadratic formula

a= 1 b= 7 c= -4

b^2-4ac= 49 - 16
b^2-4ac= 65
= 8.06

x1=( -7 + 8.06 )/ 2
x1= 0.53 5/9
x2=( -7 -8.06 ) / 2
x2= -7.53 -68/9
Ignore negative value
x = 0.53 mph LCD = speed
m.ananth@hotmail.ca

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