What is the value of 5x³+4y³ when x=4 and y=3

Answer: 428

Step-by-step explanation:

This is a substitution problems,

Just substitute for the values of x and y, multiply them out and add.

Here we go;

5x³ + 4y³

= 5 (4³) + 4 (3³)

= 5 (4 x 4 x 4) + 4 (3 x 3 x 3)

= 5 x 64 + 4 x 27

= 320 + 108 add directly or find the common factor

= 4 (80 + 27)

= 4 (107)

= 4 x 107

= 428