Is there a calculator that can factor for all the zeros in a function? Like online. I don't have a calculator.

Question

anonymous · Answer

go to google

anonymous · Answer

I have, I'm not finding anything.

anonymous · Answer

try wolframalpha

anonymous · Answer

what exactly are you trying to find?

anonymous · Answer

Find the zeros of the function f(x) = x^2 +9x + 20 by factoring.  
I have a ton of these equations.

anonymous · Answer

Or functions I guess.

anonymous · Answer

oooh then factor!!

anonymous · Answer

$$x^2+9x+20=(x+4)(x+5)$$

anonymous · Answer

and so if $x+4=0\iff x=-4$ and $x+5=0\iff x=-5$

anonymous · Answer

Where did the 4 and 5 come from?

anonymous · Answer

$4\times 5=20$ and $4+5=9$ so $$(x+4)(x+5)=x^2+4x+5x+4\times 5=x^2+9x+20$$

anonymous · Answer

oh wow. Math is weird. I get it now, thank you.

anonymous · Answer

if your job is to learn how to factor, i would not use a calculator
it will not help at all

anonymous · Answer

yeah, math is weird but it is not that weird
if you can multiply out you can usually factor
also these problems will be cooked up for you to factor easily