Question

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

Answer 1

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