4 years ago

when asked to factor the trinomial x^2-18x+81 a student gives the answer (x-9(x+9) which of the following statements is true

Mathematics

2 answers:

Alex17521 [72]4 years ago

5 0

the answer is incorrect; the plus sign should be a minus sign

charle [14.2K]4 years ago

3 0

(x - 9)(x + 9) would give you x^2 - 81 when you get a plus and minus like that after you factor the middle term is canceled out so the answer would be (x - 9)^2

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