Question

factorise: equation below

please include steps

Answer 1

\[9w ^{2}-49\]

Answer 2

what time what will give you 49?

Answer 3

Any ideas?

Answer 4

Have you learned about a difference of two squares? $$a^2-b^2=(a+b)(a+b)$$

Answer 5

7

Answer 6

so how would the two sets of parenthesis look?

Answer 7

um what's the parentesis again

Answer 8

( )( )

Answer 9

you already know he variable w will be in the beginning of both of them because
\[w \times w=w^2\]

Answer 10

so would it be 3w

Answer 11

in the bracket

Answer 12

try 3w right quick and see what you get

Answer 13

(3w + 7) (3w = 7)
do you mean write it like that and try that

Answer 14

yeap, you got it. made a typo but i understand you clearly

Answer 15

thank you i get that now

Answer 16

-7 right?

Answer 17

yep :)