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how do I factor c cubed + 27?? Answered


Tags:Math

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kiffer360

8 years ago

c^3+27
addition of cubes
(c+3)(c^2+3c+9) 

Am I reading the problem wrong?

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seandoguekiffer360

Answer 8 years ago

No, but your answer is wrong. close, but wrong.

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kiffer360seandogue

Answer 8 years ago

right, its the formula. i never can rember the correct formula. (c+3)(c2-3c+9) i think. 

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seandoguekiffer360

Answer 8 years ago

Ding!...  I guess I'd forgotten that there's a formula for disemboweling a cubic equation. I played the "guess the first term" game...

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NobodyInParticular

8 years ago

 I suspect that you were supposed to memorize the factorizations of the sum of cubes, difference of cubes, difference of squares, and perfect square trinomials. If you memorize these, you will save yourself a great deal of trouble.

(a^3^ + b^3^) =
(a^3^ - b^3^) =
(a^2^ - b^2^) =
(a^2^ + 2ab + b^2^) =
(a^2^ - 2ab + b^2^) =


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cyberpageman

8 years ago

 Another clue is C cubed = -27

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seandogue

8 years ago

Perhaps start by thinking of it as a disguised quadratic instead of a cubic equation?