The expression is: 10-x
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That's going to depend on the value of 'x'. But no matter what 'x' is, (x2-100) will be equal to the product of (ten more than 'x') and (ten less than 'x').
it is equal to +x
x = ? 42 = x squared minus x
(x - 5)(x + 4)
x - 3