(x+5)(x-2) can be expanded by multiplying the first terms of each binomial, then the outer terms, the inner terms, and finally the last terms. The resulting expression will be a binomial expression.
(x+5)(x-2) =
= x^2 – 2x + 5x -10
= x^2 + 3x -10
Therefore, (x+5)(x-2) is equivalent to x^2 + 3x -10.
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