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This type of expression is referred to as a difference of squares. Any expression in the format:

a2 - b2

Can be expanded as:

(a + b)(a - b)

In this case then, we have:

x2 - 64 = 0

(x + 8)(x - 8) = 0

This tells us that x must be equal to either 8 or -8.

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Q: Solve x2 - 64 equals 0?
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