Question

Solve using the zero principle: (9s+5)(4s-12)=0

Answer 1

first: 9s+5 = 0

9s = -5

s = -5/9

then: 4s - 12 = 0

4s = 12

s = 3

Answer 2

zero principal means that if one part of a multiplication equation equals zero then the whole equation will so:

9s + 5 = 0
9s = -5
s = -9/5

4s-12=0
4s=12
s=3

Answer 3

woops -5/9