Question

solve by factoring 49x^2 - 16 = 0

Answer 1

Is this your very first ques. on here?

Answer 2

this = (7x-4)(7x+4) do you need anything beyond that?

Answer 3

yes :/

Answer 4

i think that should help. Thank you :)

Answer 5

x= 4/7, -4/7

Answer 6

This is what's called a perfect square, which means there isn't a middle term.

\[49x ^{2}-16=0\]
(7x-4)(7x+4)=0

Now check using FOIL:

First: 7x X 7x= \[49x^{2}\]
Outside: 7x X 4= 28x
Inside: 7x X -4= -28x
Last: -4 X 4= -16

The 28x and -28x cancel each other out and you are left with \[49x ^{2}-16\]