Using quadractic formula, please solve for me, x +11x-12=0

Question

anonymous · Answer

it should be x2+11x-12=0

anonymous · Answer

u can solve this by factorising

amistre64 · Answer

the quad formula is simply plug and play; why would you need someone to do it for you?

anonymous · Answer

gernic rectangels

anonymous · Answer

I wanna make sure i'm coming up with  the right answer Amistre

amistre64 · Answer

whats your answer then? and we can check it ;)

anonymous · Answer

-11 13squared

anonymous · Answer

oops

amistre64 · Answer

it actually checks itself ; plug in the x values you find and see if they make it equal 0

anonymous · Answer

oh ok:/

amistre64 · Answer

you should come up with x = -12 and 1, if i see it right

anonymous · Answer

yep amis

amistre64 · Answer

-b        sqrt(b^2 -4ac)
-- +-  -------------
2a               2a

amistre64 · Answer

-11        sqrt(121 +48)
---- +- ------------
  2                  2

amistre64 · Answer

-11 +- sqrt(169)       -11 +- 13
--------------- =  ----------
          2                           2

-24/2 = -12

2/2 = 1

anonymous · Answer

Thanks Amis don't know where i went wrong

amistre64 · Answer

you were close; you just forgot the "/2"  and also to make sure that you use the "+-" and not just the a "+"  for the sqrt

anonymous · Answer

Oh ok