Question

How do you simplify `[x^(2/9) - 5] [x^(2/9) + 1]`?

Answer 1

You have:
`(x^(2/9)-5)(x^(2/9)+1)=`
`=x^(2/9+2/9)+x^(2/9)-5x^(2/9)-5=`
`x^(4/9)-4x^(2/9)-5`