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nordsb [41]
3 years ago
14

The binomial (x 5) is a factor of x2 8x 15. what is the other factor?

Mathematics
2 answers:
alex41 [277]3 years ago
6 0
The other factor is (x+3)
ladessa [460]3 years ago
4 0


We can do this in two different ways:

Method 1
Since
(x + 5)
is a factor, we can use it to obtain the other factor by long division(see attachment).
{x}^{2}  + 8x + 15 = (x + 5)(x + 3)


Hence the other factor is
(x + 3)

Method 2

We can factor the trinomial to obtain the other factor.

Two factors of 15 that add up to 8 are,

5,3
We split the middle term as follows:
{x}^{2}  + 8x + 15 =  {x}^{2}  + 3x + 5x + 15
{x}^{2}  + 8x + 15 =  x(x + 3) + 5(x + 3)
{x}^{2}  + 8x + 15 =  (x + 3) (x + 5)
Hence the other factor is

(x + 3)

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