Question

Expand: z(5z+3) what is this guys ???

Answer 1

`5z^2+3z`

Explanation:

`z\left(5z+3\right)=z\cdot \:5z+z\cdot \:3\\z\cdot \:5z+z\cdot \:3\\z \cdot 3 = 3(z)`

5z becomes squared

`z\cdot \:5z\\= 5z^2`

z • z = z²

Remove parentheses

`3(z)\\= 3z\\= 5z^2 + 3z`

Hope this helps.