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(-8 + b2) - (5 + b2) = -8 + b2 - 5 - b2 = -13
The equation (b2 - 2b) + (3b - 6) = b2 + b - 6
a2
All you need to do is substitute the given values of a and c into the equation, then solve for c: a2 + c2 = b2 102 + 302 = b2 100 + 900 = b2 b2 = 1000 b = √1000 b = 10√10
With the standard notation, If b2 < 4ac then the discriminant is negative If b2 = 4ac then the discriminant is zero If b2 > 4ac then the discriminant is positive