Answer:
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Step-by-step explanation:
10 (8-x)(8+x)
640-10x^2
Factor out 10
10 (64 - x^2)
Notice that inside the parentheses is the difference of squares
10 ( 8^2 - x^2) and a^2 - b^2 = (a-b) (a+b)
c. 4.9713
That's the answer