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solve 5 and 6 by qudratic equation ax+b+c=0

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Riza1viz
[tex]x_{1}=5, \ \ x_{2}=6 \\\\ax^2 + bx + c = 0\\\\We \ can \ change \ the \ quadratic \ equation \ to \ the \ form \ of:\\\\(x - x _{1})(x - x _{2}) = 0 \\ \\(x-5)(x-6)=0\\ \\x^2-6x-5x+30=0\\ \\x^2-11x+30=0[/tex]