SOLUTION: i know i asked for one help but i need one more please? factor completely? x^2-16

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Question 81363: i know i asked for one help but i need one more please?
factor completely?
x^2-16
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
ERROR Algebra::Solver::Engine::invoke_solver_noengine: solver not defined for name 'quadratic_factoring'.
Error occurred executing solver 'quadratic_factoring' .



You can also use the difference of squares by noticing that x%5E2-16 is in the form a%5E2-b%5E2 where a=x and b=4 so following the difference of squares we get

Difference of squares
a%5E2-b%5E2=%28a%2Bb%29%28a-b%29

Plug in a=x and b=4

x%5E2-4%5E2=%28x%2B4%29%28x-4%29

which is what we got orginally