Question

How do you simplify `(5x + sqrt7)^2`?

Answer 1

`25x^2+10xsqrt7+7`

Explanation:

`(5x+sqrt7)^2 = (5x+sqrt7)(5x+sqrt7)`

expand brackets using FOIL:
`(5x+sqrt7)^2 =(5x+sqrt7)(5x+sqrt7)`
`= 25x^2+5xsqrt7+5xsqrt7+sqrt7^2`

`=25x^2+10xsqrt7+7`