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35^2+b^2=21^2
We move all terms to the left:
35^2+b^2-(21^2)=0
We add all the numbers together, and all the variables
b^2+784=0
a = 1; b = 0; c = +784;
Δ = b2-4ac
Δ = 02-4·1·784
Δ = -3136
Delta is less than zero, so there is no solution for the equation
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