Kuoministers
can x^3 + 8 be factorised? if so it is using
a3 + b3 = (a + b)(a2 – ab + b2)?



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backpack799
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(x2)(x^2 + 2x + 4)

Kuoministers
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But the question is x^3 + 8 not minus?

hartnn
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yes, and your are correct,a=x and b=2

hartnn
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*you

Kuoministers
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Well i was looking to find it in factored from not the answer

Kuoministers
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form*

hartnn
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yeah, i didn't give any answer...
factored form will be ... ?

hartnn
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x^3+2^3 = (...+...)(........+...)

hba
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Well the formula are as follows,
\[a^3 + b^3 = (a + b)(a^2 – ab + b^2)\]
\[a^3  b^3 = (a  b)(a^2 + ab + b^2)\]

Kuoministers
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(x+2)(x^2 2 + 4)
Is this right?

hartnn
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the 2nd term in 2nd bracket is incorrect.

Kuoministers
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i mean 2x opps (x+2)(x^2 2x + 4)

hartnn
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yeah, now correct....

hba
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Yeah right

Kuoministers
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thanks

hba
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Your'e welcome.