Question

How do you simplify `y^4*y^5`?

Answer 1

Use this rule for exponents:

`x^color(red)(a) xx x^color(blue)(b) = x^(color(red)(a) + color(blue)(b))`

`y^color(red)(4) xx y^color(blue)(5) => y^(color(red)(4) + color(blue)(5)) => y^9`