Question

need help factoring:
-42x^2 + 306xy - 84y^2

i have -6(7x^2 - 51xy + 14y^2) so far.

Answer 1

\[-42x ^{2} + 306xy - 84y ^{2}\]

Answer 2

split the middle term :
-51 = -49 - 2

Answer 3

-6(7x^2 - 49 - 2 + 14y^2)

Answer 4

group now?

Answer 5

who ate xy

Answer 6

im sorry lol.

Answer 7

-6(7x^2 - 49xy - 2xy + 14y^2)

right ? :)

Answer 8

yeah thats right :)

Answer 9

yeah everything is same as you woudl factor a regular quadratic

Answer 10

group first two terms
last two terms

Answer 11

i got 7x - 2y (x - 7y) ?

Answer 12

do you mean

-6(7x - 2y) (x - 7y)

?

Answer 13

oh
yeah i was wondering about the -6
so yes
i mean that.

Answer 14

Looks good !
you can always verify your work with wolfram
http://www.wolframalpha.com/input/?i=factor+-42x%5E2+%2B+306xy+-+84y%5E2

Answer 15

oh wow
they just tell you the answer though?

Answer 16

yes which is exactly what you need to verify your work

Answer 17

okay, thank you so much :)

Answer 18

np :)