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Ratling [72]
3 years ago
15

Choose one of the factors of x^3 + 343.

Mathematics
1 answer:
Debora [2.8K]3 years ago
3 0

First, note that 343=7^3. Then use the formula for the sum of perfect cubes:

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

Therefore,

x^3 + 343=x^3+7^3=(x+7)(x^2-7x+49).

The quadratic trinomial x^2-7x+49 couldn't be factored anymore, so the expression x^3 + 343 has two factors x+7 and x^2-7x+49.

Answer: correct choice is A.

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3 years ago
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3 years ago
Which of the following questions describes the equation = a/4 -20?
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