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- 7 years agoFavorite Answer
R= 1.1926, -4.1926

Try using MathWay.com

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- DWReadLv 77 years ago
r² + 3r = 5

set to 0

r² + 3r - 5 = 0

quadratic formula

r = [-3 ± √(3² + 4·1·5)]/(2·1)

= [-3 ± √29]/2

= -1.5 ± 0.5√29

≅ -4.193, 1.193

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- peterpanLv 77 years ago
r^2+3r-5=0

r=[-3+-sqrt(9+20)]/2

r1=(-3+5.385)/2=1.1925

r2=(-3-5.385)/2=-4.1925

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