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maaf sepertinya bukan x²+6x-5, tp x²+6x+5
mksh
X^2 - ((a+2) + (b+2))x + (a+2)(b+2) = 0
X^2 - (a+b+4)x + (a.b +4a.b +4) = 0
X^2 - (a+b+4)x + (5a.b +4) = 0
X^2 - ((-6/2) + 4)x + (5.(-5/2) +4 = 0
(x^2 - x -21/2 =0 ).2
2x^2 - 2x - 21 = 0