SOLUTION: use the quadratic formula to solve the following equations
(r-2)(r+6)=11
simplify your answer. type an exact answer using radicals as needed. use integers or fractions for an
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Question 547137: use the quadratic formula to solve the following equations
(r-2)(r+6)=11
simplify your answer. type an exact answer using radicals as needed. use integers or fractions for any numbers in the expression. use a comma to seperate answers as needed.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
(r-2)(r+6)=11
r(r+6)-2(r+6)+11=0
r^2+6r-2r-12+11=0
r^2+4r-1=0
Find the roots of the equation by quadratic formula
a= 1 ,b= 4 ,c= -1
b^2-4ac= 16 + 4
b^2-4ac= 20
x1=( -4 + 4.47 )/ 2
x1= 0.24
x2=( -4 -4.47 ) / 2
x2= -4.24
you can also work it out in fractions
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