Question

I was just wondering how he got the 14y thank u!

Answer 1

Given equation is:

`3y^2+(y+7)^2-15`

let us simplify,

use the formula

`(a+b)^2=a^2+2ab+b^2`
`\begin{gathered} 3y^2+(y+7)^2-15^{} \\ 3y^2+(y^2+2\cdot7\cdot y+7^2)-15 \\ 3y^2+y^2+14y+49-15 \\ 4y^2+14y+34 \end{gathered}`

The answer is

`4y^2+14y+34`