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# I need to fator this polynomail completly: 4g^2(g-3)+(g-3)

I need to fator this polnomail completly 4g^2(g-3)+(g-3)

Need to clarify since this could be understood several ways

is it

(4g^2)(g-3)+(g-3)

or

[4g^2(g-3)]+(g-3)

or

4g^[2(g-3)+(g-3)]

### 3 Answers by Expert Tutors

Jordan K. | Nationally Certified Math Teacher (grades 6 through 12)Nationally Certified Math Teacher (grade...
4.9 4.9 (79 lesson ratings) (79)
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To completely factor the polynomial, 4g2(g - 3) + (g-3), we must begin by pulling out the common factor
(g - 3) from both terms of this polynomial, which gives us (g - 3)(4g2 + 1). If the other factor (4g2 + 1) was instead (4g2  -1 ) then we could apply the factoring pattern for the difference of two perfect squares (a2 - b2), which is (a + b)(a - b) where in our case we would substitute 2g for a and 1 for b giving us the factors of (2g + 1)(2g - 1).  However, since our other factor is the addition of two perfect squares
(4g2 + 1), our final answer is (g - 3)(4g2 + 1).

Tatiana S. | Tutor of Mathematics &amp; StatisticsTutor of Mathematics &amp; Statistics
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If you are learning imaginary numbers as well you could go one step further:

4g^2(g-3)+(g-3) = (g-3)(4g^2+1) = (g-3)(2g+i)(2g-i)

To clarify:

"i" stands for imaginary number:

(2g+i) (2g-i) = 4g2 - i2 = 4g2-(-1) = 4g2+1

Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
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