If x = 4 and y = 5, find the difference of y³ - 3x and x³ - 3y.

A.) 5

B.) 25

C.) 64

D.) 34

E.) 27

A.) 5

B.) 25

C.) 64

D.) 34

E.) 27

y³ - 3x - (x³ - 3y) {subtracting}

= y³ - 3x - x³ + 3y {distributed negative sign through parentheses}

= (5)³ - 3(4) - (4)³ + 3(5) {substituted 4 in for x and 5 in for y}

= 125 - 12 - 64 + 15 {evaluated exponents and multiplied}

= 64

**{added and subtracted from left to right}**

**C.) 64**

*- Algebra House*