I need to know How to Factor?1?!?

Question

How do i factor (x-5)(x+4)?

Answer 1

The terms 'x - 5' and 'x + 4' are already the factors of a quadratic expression. If you need to multiply the factors together to get the quadratic expression, follow the FOIL rule: Multiply the firsts, then the outsides, then the insides, and finally the lasts:

(x - 5) * (x + 4)

(x * x) + (x * 4) - (5 * x) - (5 * 4)

or

x^2 + 4x - 5x - 20

Combining terms:

x^2 - x - 20

Answer 2

Remember this: FOIL  

F= front

O= outer

I= inner

L= last

so for F you would do the 2 front numbers in each () and multiply

x*x= x squared

for O you'd do the the 2 numbers on the outside x and 4 and multiply

Xx4= 4x

for I you'd take the numbers inside -5 and X and multiply

-5xX= -5x

then for L take the last 2 numbers in each () -5 and 4 and multiply

-5x4= -20

put them all together in order

x^2+4x-5x-20 then combine like terms

x^2-x-20

that's your answer

Answer 3

http://www.math.com/school/subject1/less...

Factoring is like taking a number apart. It means to express a number as the product of its factors. Factors are either composite numbers or prime numbers (except that 0 and 1 are neither prime nor composite).

go here and try your luck

Answer 4

Heres how I believe you solve this:::

(x-5) (x+4)

x (squared) +4x - 5x -20

x (squared) -x -20

you multiply the X times the X, then the X times the 4, then the -5 times the X, then the -5 times the 4.

:)