Question 41570
<pre>x^2 - 13x + 36

what two numbers add up to -13 and multiply to 36?
We know they are both negative for producing a positive product and a negative sum.
36=18*2=9*4 aha! sum of 13!
so..
x<sup>2</sup>-9x-4x+36  factor like terms
x(x-9)-4(x-9)  put like terms together
(x-4)(x-9) ther ya go!
ax 4 questionz