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.

Answered by Luke P. Maths tutor

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