HAA1812
HAA1812
19-03-2017
Mathematics
contestada
r2+2r-33=0 solve by completing the square
Respuesta :
irspow
irspow
19-03-2017
r^2+2r-33=0 move constant to other side by adding 33 to both sides
r^2+2r=33 halve the linear coefficient, square it and add to both sides, in this case it is just one
r^2+2r+1=34 now the left side is a perfect square...
(r+1)^2=34 take the square root of both sides...
r+1=34^(1/2) subtract 1 from both sides
r=-1+34^(1/2) and -1-34^(1/2)
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