SOLUTION: Solve each equation by the quadratic formula. Give only real number solutions. 2x2-4x=5

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Question 860572: Solve each equation by the quadratic formula. Give only real number solutions. 2x2-4x=5
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
2x2-4x=5
2x2-4x-5=0
Find the roots of the equation by quadratic formula

a= 2 , b= -4 , c= -5

b^2-4ac= 16 + 40
b^2-4ac= 56
%09sqrt%28%0956%09%29=%097.48%09
x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29
x1=( 4 + 7.48 )/ 4
x1= 2.87
x2=%28-b-sqrt%28b%5E2-4ac%29%29%2F%282a%29
x2=( 4 -7.48 ) / 4
x2= -0.87
x=2.87, OR -0.87