Question

y=x^2+8x+14
I have to solve by factoring, and I'm stumped. I know it's not a perfect square, so I don't really know what to do. Please help! Thanks!

Answer 1

do u remember...
2 numbers that multiply result 14
and added result in 8

Answer 2

You can do the cross multiplication method:

http://www.mathsteacher.com.au/year9/ch08_factors/07_cross/mult.htm

Answer 3

but 7 and 2 dont add up to 8

Answer 4

http://www.algebrahelp.com/calculators/equation/factoring/calc.do;jsessionid=37346B45F96656B788B51D1F1C247CA6?equation=+y%3Dx^2%2B8x%2B14+&solvf=AUTO
this site always helped me

Answer 5

nothing works though

Answer 6

You can do completing the square.

http://www.purplemath.com/modules/sqrquad.htm

Answer 7

@musicalcat98

Answer 8

I have to do graphing, factoring, quadratic equation, and completing the square. Thats the thing. I have everything else done except factoring. @dauspex

Answer 9

Ohh. The last resort is to have fraction / decimal factorials for the 14. Let me try

Answer 10

I cheated by using a quadratic equation solver:

x = -2.585786437626905
x = -5.414213562373095

Thus (x + 5.414213562373095) (x + 2.585786437626905)

Impossible to do by cross multiplication.
@musicalcat98

Answer 11

Okat thank you! @dauspex