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').
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x = ? 42 = x squared minus x
(x - 5)(x + 4)
Sin squared, cos squared...you removed the x in the equation.
The answer to x2 - 2x - 4y2 - 4y =(x - 2y)(x - 2y - 2)
What about it? Factorise it?