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x^2-9x+20 factorise quadratics

Algebra
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familiar with quadratic formula?
no :(
this one can be factorized

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Other answers:

can u factorize @Raeee_009 ?
  • hba
Quadratic formula \[x=-b \pm \sqrt{b^2-4ac}/2a\]
\[x = \frac{ -b \pm \sqrt{b ^{2}-4ac } }{ 2a}\] this is the quadratic formula now look at your equation it's x^2-9x+20 so a =1 ,b = -9 , c = 20 just plug in values you will get 2 values of x
that is so confusing
yes - you asked about factoring quadratics factor to the form (x +/- a)(x +/- b)
to find a and b you need the product ad = +20 and sum = -9 can u think of 2 numbers which fit this requirement?
* product ab = + 20
hmm.. still don't get it :(
20 = -4 * -5 right?
yeah
and -4 + -5 = ?
  • hba
|dw:1353601861741:dw|
-9
so thats your values of a and b hba has illustrated the process in his drawing
ohh im understanding a bit now so is the answer (x-4) (x+9)
yea
  • hba
hba - your method is slightly different to mine - true
  • hba
I am talking about the answer she got ?
(x-4)(x-5)
oh yes - i misread it (x - 4)(x - 5) is correct solution a = -4 and b = -5 raee_009
  • hba
@Raeee_009 Please see my illustration and try to learn ? Where are you getting confused ?
ohhhh! i get it now! thank you so much eveyone
  • hba
Your'e welcome.
one quick question does a + and - = - ?
  • hba
Well (+)(+)=+ (+)(-)=- (-)(-)=+ Got it ?
ohh yeah thanks :D
so would x^2-6x-7=(x-7)(x+1)
right
  • hba
|dw:1353603740199:dw| @Raeee_009 Awesome :D

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