Question
Factor polynomial $$ 2x^{2}-18 $$
Answer
$$ 2x^{2}-18 = 2( x-3 )( x+3 ) $$
Explanation
Step 1 :
After factoring out $ 2 $ we have:
$$ 2x^{2}-18 = 2 ( x^{2}-9 ) $$Step 2 :
Rewrite $ x^{2}-9 $ as:
$$ x^{2}-9 = (x)^2 - (3)^2 $$Now we can apply the difference of squares formula.
$$ I^2 - II^2 = (I - II)(I + II) $$After putting $ I = x $ and $ II = 3 $ , we have:
$$ x^{2}-9 = (x)^2 - (3)^2 = ( x-3 ) ( x+3 ) $$This page was created using
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