expand and simplify (x+3)(x-7)
(x+3)(x-7)
= (xx) + (x-7) + (x3) + (3-7)
= x^2 - 7x + 3x - 21
= x^2 - 4x - 21
Key here is to ensure you multiply each term in one bracket by both in the other, and to keep careful track of the signs.
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