Mathematics
By using standard formulae, expand the following:
(x-7)(x+9)
Expansions
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Answer
We know that (x-a)(x+b) = x2 - (a - b)x - ab
∴ (x-7)(x+9) = x2 - (7 - 9)x - (7)(9) = x2 + 2x - 63
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By using standard formulae, expand the following:
(x-7)(x+9)
13 Likes
We know that (x-a)(x+b) = x2 - (a - b)x - ab
∴ (x-7)(x+9) = x2 - (7 - 9)x - (7)(9) = x2 + 2x - 63
Answered By
10 Likes