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December 20, 2014

December 20, 2014

Posted by **Mary** on Monday, April 1, 2013 at 8:22pm.

Can you help me?

Factor. If the result is the square of a binomial, write it as such. If the result is prime, so state.

Here are the first couple of problems.

1) x^2 + 7x + 12

2) x^2 - x - 12

3) x^2 - 4x - 12

- Algebra -
**Reiny**, Monday, April 1, 2013 at 9:33pmWith these easy ones that start with 1x^2

look at the last term

e.g for x^2 + 7x + 12

last term is 12,

can you find two factors of 12 that have a sum of the middle term, namely 7 ?

yes: 3 and 4

3x4 =12

3+4 = 7

so the factors are (x+3)(x+4)

2nd:

s^2 - x -12

can you find two factors of -12 that have a sum of -1 ?

yes! , -4 and 3

-4(3) = -12

-4 + 3 = -1

so (x-4)(x+3)

you try the last one, let me know what you got

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