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den301095 [7]
3 years ago
10

Factor completely. 9x4 + 12x3 – 45x2 – 60x

Mathematics
2 answers:
faust18 [17]3 years ago
8 0
The answer is C if not sorry
Fofino [41]3 years ago
7 0

Answer:  The correct option is

(C) 3x(x^2-5)(3x+4).

Step-by-step explanation:  We are given to completely factor the following bi quadratic expression :

E=9x^4+12x^3-45x^2-60x~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)

Since the given expression does not contain the constant term, so we will take out the x-term common and then will try to factorize the remaining cubic expression.

The factorization of expression (i) is as follows :

E\\\\=9x^4+12x^3-45x^2-60x\\\\=3x(3x^3+4x^2-15x-20)\\\\=3x(x^2(3x+4)-5(3x+4))\\\\=3x(x^2-5)(3x+4).

Thus, the required factored form of the given expression is 3x(x^2-5)(3x+4).

Option (C) is CORRECT.

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Answer:

The binomial: (x-2) (second option of the list) is a factor of the given trinomial

Step-by-step explanation:

You are looking for two binomial factors of the form; (x+a) and (x+b), with values "a" and "b" such that:

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and their combining "a+b" results in "-9" (the coefficient in the middle term of the trinomial)

Such number "a" and "b" are: "-2" and "-7".

We can see by multiplying the binomials formed with these numbers:

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therefore, the binomials (x-2) and (x-7) are factors of the given trinomial.

The only one shown among the four possible options is then: (x-2)

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3 years ago
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