Factoring to solve equations, part 2

A math video tutorial on factoring to solve equations, in Algebra I

Category:

Howto & Style

Tags:

• factoring
• algebra
• equations

[Hansen48066]

There are a few techniques, but probably easiest to "experiment" with different products to get -5x^2, and different products to get -28, such that the outside and inside products sum to 31x. For example: (-5x + 14)(x - 2) doesn't work b/c when you FOIL back, you get -5x^2 +24x - 28. The middle term is wrong. So, try other combinations to multiply to get -5x^2 and - 28, but a different middle term. Try

(-5x - 4)(x - 7). This doesn't work either. Try quadratic formula or maybe you made a typo?

[Hansen48066]

Glad I could lend some help!

[eazybreezyxoxo]

but what about the 2?

thank you for doing a more comlex problem than just a simple example

[TheDraconman]

MR. Hansen i"ve got a question for you. What do you do when the equation looks like this - 5x squared + 31x-28

[theatregeek69321]

thank you so much. you were very helpful.

[sk8crazy98]

Thanks man you really saved me from getting a D in math, and my parents

[hassanaustralia]

thanx mate ur a great teacher u helped me understand

[iheartedward12]

thanks you saved me from failing a math test!

[dandanish]

great vid!

[eSkates24]

thanks alot it helped