92=-4(2r-5)r=

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Solution for 92=-4(2r-5)r= equation: 



92=-4(2r-5)r=

We move all terms to the left:

92-(-4(2r-5)r)=0



We calculate terms in parentheses: -(-4(2r-5)r), so:

-4(2r-5)r

We multiply parentheses

-8r^2+20r

Back to the equation:

-(-8r^2+20r)



We get rid of parentheses

8r^2-20r+92=0

a = 8; b = -20; c = +92;
Δ = b2-4ac
Δ = -202-4·8·92
Δ = -2544
Delta is less than zero, so there is no solution for the equation

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