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-4u=-(-16/7)
We move all terms to the left:
-4u-(-(-16/7))=0
We multiply all the terms by the denominator
-4u*7))-(-(-16=0
Wy multiply elements
-28u^2-16=0
a = -28; b = 0; c = -16;
Δ = b2-4ac
Δ = 02-4·(-28)·(-16)
Δ = -1792
Delta is less than zero, so there is no solution for the equation
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