Please explain it and try to provide an answer as soon as possible.
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First we need to find the roots (zeroes) of the quadratic 18x²+21x-400=(6x-25)(3x+16).

So the zeroes are 25/6 and -16/3. The sum of the squares is 625/36+256/9=(625+1024)/36=1649/36.

by Top Rated User (646k points)

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