AJRo
27.07.2019 •
Mathematics
Worth 20 points and ! some steps to rewrite the expression x3 − 9x + x2 − 9 as a product of three factors are shown below: step 1: x3 − 9x + x2 − 9 step 2: x3 + x2 − 9x − 9 step 3: x2(x + 1) − 9(x + 1) which of the following best shows the next two steps to rewrite the expression? step 4: (x2 + 9)(x + 1); step 5: (x + 3)(x + 3)(x + 1) step 4: (x2 − 9)(x + 1); step 5: (x + 3)(x + 3)(x + 1) step 4: (x2 + 9)(x + 1); step 5: (x − 3)(x + 3)(x + 1) step 4: (x2 − 9)(x + 1); step 5: (x − 3)(x + 3)(x + 1)
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Ответ:
The correct option is D) Step 4:; Step 5: (x − 3)(x + 3)(x + 1).
Step-by-step explanation:
Consider the provided expression.
Step 1: The provided expression is:
Step 2:
Step 3:
Step 4:
This can be written s:
Step 5: Use the formula,
Hence, the correct option is D) Step 4: ; Step 5: (x − 3)(x + 3)(x + 1).
Ответ:
2x • (x^3y^3 + 2)
Step-by-step explanation:
4x + (2x3y • y) • x) • y)
Pulling out like terms :
3.1 Pull out like factors :
2x4y3 + 4x = 2x • (x3y3 + 2)
Trying to factor as a Sum of Cubes :
3.2 Factoring: x3y3 + 2
Theory : A sum of two perfect cubes, a3 + b3 can be factored into :
(a+b) • (a2-ab+b2)
Proof : (a+b) • (a2-ab+b2) =
a3-a2b+ab2+ba2-b2a+b3 =
a3+(a2b-ba2)+(ab2-b2a)+b3=
a3+0+0+b3=
a3+b3
Check : 2 is not a cube !!
Ruling : Binomial can not be factored as the difference of two perfect cube
Final result :
2x • (x^3y^3 + 2)
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