Question

find the nonpermissible replacement in this expression (8)/(-9a)

Answer 1

The nonpermissible replacement makes the denominator equal zero, so we set the denominator to zero and solve.\[-9a = 0\]Do you know how to solve that?

Answer 2

add 9 to both sides? @OakTree

Answer 3

Not add, but divide both sides by -9. You're multiplying x by -9, not subtracting 9 from it. Makes sense?

Answer 4

Great.