#3**+1 **

We know that the bionomial must be \((2x + y)^2\), that way the 2 2x's multiply out to \(4x^2\)

Expanding the bionomial out as is gives us: \(4x^2+2xy+2xy+y^2\)

We want the 2 2xy's to sum to 14x, so we have the equation: \(4xy= 14x\). Solving for y, we find \(y = {7 \over2}\)

Now, we have to findsubsitute this in, and expand.

Hint: The co-efficent will be \(y^2\)

BuilderBoi May 13, 2022