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Quadratic function by factoring by zeros
Y=[tex] x^{2} [/tex]+8×-9

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[tex]y= x^{2} +8x-9 \\\\x^{2}-x+x +8x-9 =0\\\\( x^{2}-x)+(9x-9) =0\\\\x(x-1)+9(x-1)=0\\\\(x-1)(x+9)=0\\ \\x-1=0 \ \ or \ \ x+9=0\\\\x=1 \ \ or \ \ x=-9 [/tex]