Which of the following is a factor of x^2+x-30?

2008-02-27 8:20 am
a.x+5
b.x+6
c.x+15
d.x-15

回答 (7)

2008-02-27 8:25 am
✔ 最佳答案
(x + 6)(x - 5)
OPTION b.
2008-02-27 8:23 am
B

The polynomial factors into (x+6)(x-5)
2008-02-27 8:33 am
x^2 + x - 30
= (x + 6)(x - 5)

∴ the answer is b.
2008-02-27 8:29 am
b.x+6

the factors are
(x-5) and (x+6) since by multiplying

(x-5)(x+6) = x^2 + x -30
2008-02-27 8:28 am
x^2+6x-5x-30
x(x+6)-5(x+6)
(x+6)(x-5)

so, the ans is (x+6)
2008-02-27 8:28 am
x^2+x-30

=> x^2 + 6x -5x -30
= x(x+6) - 5(x+6)
= (x-5)(x+6) are the factors

so the correct ans is 'b'
2008-02-27 8:27 am
hi!

b


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