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Activity D: Cube of a Binomial
Find the product of the following.
1. (x + 4)³
2. (2x + 3)³
3. (4m - 3n)³
4. (3a-2b)³
5. (x²y + 2z³)³​


Sagot :

cube of a binomial:

(x + y)³ = x³ + 3x²y + 3xy² + y³

1.) (x + 4)³ = (x)³ + 3(x)²(4) + 3(x)(4)² + (4)³

(x)³ =

3(x)²(4) = 12x²

3(x)(4)² = 48x

(4)³ = 64

+ 12x² + 48x + 64

2.) (2x + 3)³ = (2x)³ + 3(2x)²(3) + 3(2x)(3)² + (3)³

(2x)³ = 8x³

3(2x)²(3) = 36x²

3(2x)(3)² = 54x

(3)³ = 27

8x³ + 36x² + 54x + 27

3.) (4m - 3n)³ = (4m)³ - 3(4m)²(3n) + 3(4m)(3n)² - (3n)³

(4m)³ = 64m³

- 3(4m)²(3n) = -144m²n

3(4m)(3n)² = 108mn²

- (3n)³ = -27n³

64m³ - 144m²n + 108mn² - 27n³

4.) (3a - 2b)³ = (3a)³ - 3(3a)²(2b) + 3(3a)(2b)² - (2b)³

(3a)³ = 27a³

- 3(3a)²(2b) = -54a²b

3(3a)(2b)² = 36ab²

- (2b)³ = -8b³

27a³ - 54a²b + 36ab² - 8b³

5.) (x²y + 2z³)³ = (x²y)³ + 3(x²y)²(2z³) + 3(x²y)(2z³)² + (2z³)³

(x²y)³ = x⁶y³

3(x²y)²(2z³) = 6x⁴y²z³

3(x²y)(2z³)² = 12x²yz⁶

(2z³)³ = 8z⁹

x⁶y³ + 6xy²z³ + 12x²yz + 8z