Example of Sum Of Cubes

The cubes are values numerical or algebraic that are raised to the exponent 3, that is, they multiply by themselves over and over again. For example, the number 2 cubed results in 8 like this: 2³ = 2 * 2 * 2 = 8. The results of the cubes can participate in arithmetic operations, such as addition. When we talk about a sum of cubes, we can refer to different cases:

• Sum of algebraic expressions cubed
• Sum of fractions cubed
• Sum of numbers cubed

The requirement for a sum of cubes to be calculated is that all cubes have to be solved first, in order to add the results at the end.

Sum of algebraic expressions cubed

When we have algebraic expressions, we can have different cases:

• x³ + and³ + z³: This is a sum of x cubed, more and to the bucket, more z cubed. This is indicated, and it can no longer be reduced because the terms are not similar.
• (x + 1)³ + (and + 1)³: This is a sum of two binomials that are cubed. First you have to solve them according to the remarkable product of the binomial cubed, and then add the resulting terms.

Sum of fractions cubed

When you are handling fractions and they are cubed, you have to solve them first, and then proceed to adding the fractions.

• (1/2)³ + (1/4)³ = (1/2*1/2*1/2) + (1/4*1/4*1/4) = 1/8 + 1/64 = (8+1)/64 = 9/64
• (1/3)³ + (1/6)³ = (1/3*1/3*1/3) + (1/6*1/6*1/6) = 1/27 + 1/216 = (8+1)/216 = 9/216

Sum of numbers cubed

When you add cubed numbers, you simply solve the cubes and then add the results.

• 2³ + 5³ = (2*2*2) + (5*5*5) = 8 + 125 = 133
• 3³ + 8³ = (3*3*3) + (8*8*8) = 27 + 512 = 539

Sum of Cubes Example: Cubed Algebraic Expressions

1.- x³ + and³ + z³

2.- a³ + b³ + c³

3.- d³ + f³ + h³

4.- a³x³ + b³Y³ + c³z³

5m³ + n³ + or³

6.- (a + 1)³ + (x + 1)³ = (a³ + 3a² + 3a + 1) + (x³ + 3x² + 3x + 1) = to³ + x³ + 3a² + 3x² + 3a + 3x + 2

7.- (b + c)³ + (c + d)³ = (b³ + 3b²c + 3bc² + c³) + (c³ + 3c²d + 3cd² + d³) = b³ + 3b²c + 3bc² + 2c³ + 3c²d + 3cd² + d³

Example of adding cubes: cubed fractions

1.- (1/2)³ + (1/4)³ = (1/2*1/2*1/2) + (1/4*1/4*1/4) = 1/8 + 1/64 = (8+1)/64 = 9/64

2.- (1/3)³ + (1/6)³ = (1/3*1/3*1/3) + (1/6*1/6*1/6) = 1/27 + 1/216 = (8+1)/216 = 9/216

3.- (2/3)³ + (1/5)³ = (2/3*2/3*2/3) + (1/5*1/5*1/5) = 8/27 + 1/125 = (1000+27)/3375 = 1027/3375

4.- (1/8)³ + (1/4)³ = (1/8*1/8*1/8) + (1/4*1/4*1/4) = 1/512 + 1/64 = (1+8)/512 = 9/512

5.- (3/4)³ + (5/4)³ = (3/4*3/4*3/4) + (5/4*5/4*5/4) = 27/64 + 125/64 = (27+125)/64 = 152/64

Example of adding cubes: cubed numbers

1.- 2³ + 3³ = (2*2*2) + (3*3*3) = 8 + 27 = 35

2.- 3³ + 4³ = (3*3*3) + (4*4*4) = 27 + 64 = 91

3.- 4³ + 5³ = (4*4*4) + (5*5*5) = 64 + 125 = 189

4.- 5³ + 6³ = (5*5*5) + (6*6*6) = 125 + 216 = 341

5.- 6³ + 7³ = (6*6*6) + (7*7*7) = 216 + 343 = 559

6.- 7³ + 8³ = (7*7*7) + (8*8*8) = 343 + 512 = 855

7.- 8³ + 9³ = (8*8*8) + (9*9*9) = 512 + 729 = 1241

8.- 9³ + 10³ = (9*9*9) + (10*10*10) = 729 + 1000 = 1729

9.- 2³ + 3³ + 4³ = (2*2*2) + (3*3*3) + (4*4*4) = 8 + 27 + 64= 99

10.- 7³ + 8³ + 9³ = (7*7*7) + (8*8*8) + (9*9*9) = 343 + 512 + 729 = 1584

Follow with:

• Binomial cubed
• Trinomial cubed