00:01
Hi there, we are given the q.
00:04
This is the function name, q, is equal to 4x squared plus y squared, and also x plus y is equal to 9.
00:11
So the first objective is write down the function q in terms of x.
00:17
Let's start with x plus y.
00:20
We know that x plus y is equal to 9.
00:22
This is given in the question.
00:24
So we can just express y in terms of x, which is 9 over x.
00:28
I just send x to the right hand side.
00:31
So in order to just express the q in terms of x, just only x, we have to just plug in the value of y into the equation, which is 4x squared we have, and 5 times y squared...