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maksim [4K]
3 years ago
13

Factor completely: 9x3 + 9x2y - 4x - 4y

Mathematics
2 answers:
Sholpan [36]3 years ago
4 0

Answer:

(x+y)(3x+2)(3x-2)

Step-by-step explanation:

The given expression is 9x^3+9x^2y-4x-4y

Make group as shown below

(9x^3+9x^2y)+(-4x-4y)

Factor out GCF from each of the group

9x^2(x+y)-4(x+y)

Now, factored out the common term

(x+y)(9x^2-4)

Now, rewrite the expression in perfect square form

(x+y)((3x)^2-2^2)

Apply the difference of squares formula: a^2-b^2=(a+b)(a-b)

(x+y)(3x+2)(3x-2)

Hence, the factored form of the given expression is

(x+y)(3x+2)(3x-2)

belka [17]3 years ago
3 0
9x^3 + 9x^2y - 4x - 4y

= 9x^2(x + y) -4(x + y)

= (x +y)(9x^2-4)

= (x +y)(3x - 2)(3x + 2)
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