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tmcclaskey19
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Answer:

100.

Step-by-step explanation:

[tex] x(x+8) = 9[/tex]

[tex] x^2+8x = 9[/tex]

[tex] x^2+8x-9 = 0[/tex]

In that formula we have that a = 1 (coefficient of x^2), b = 8 (coefficient of x) and c= -9 (independent term). Then,

[tex]b^2-4ac = 8^2-4(1)(-9) = 64+36 = 100[/tex].