why is it 4 and not -4 ? (attached)

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why is it 4 and not -4 ? (attached)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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c=4 because x^2-9=8x-25 when x=4
If x was -4, you would have x^2 - 9 = 16-9 = 5 But 8x-25 = 8(-4) - 25 = 57 So they aren't equal at that point.

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Other answers:

\[c^{2}-9 = 8c -25\]\[c^{2} - 8c +16 = (c-4)^{2}\] sorry.. forgot i have to invert the root that i find in the parethesis
Err 16-9 =7
c^2-9-8c+25=0 c^2-8c+16=0 (c-4)^2=0 oh thats what you have nvm
yup but thanks hehe

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