Question

If y = 3ab + 2b3, what is y when a = 1 and b = 2

Answer 1

Answer:  The required value of y is 22.

Step-by-step explanation:  We are given the following function of a and b :

$y=3ab+2b^3~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

We are to find the value of y when a = 1 and b = 2.

To find the required value of y, we need to substitute the values of a and b in equation (i).

From (i), we get

$y=3\times1\times2+2\times2^3=6+16=22.$

Thus, the required value of y is 22.