So discriminant is being counted from that equation:
b^2-4ac = 36-36 = 0
As discriminant is 0, then there is just 1 root -> -b/2a = 6/2 = 3.
Answer: -4
Step-by-step explanation: -4/4 = -1
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Nvm wait I read the question wrong. The real answer would be 28, 28, 36
