Expand \((y + 15z – 2)(6y + 9)\).
 
Answer:
 
\((y + 15z – 2)6y\) \(=\) iyi+izy−iy
 
\((y + 15z – 2) 9\) \(=\) iy+iz−i
 
\((y + 15z – 2)(6y + 9)\) \(=\) iyi−iy+iyz+iz−i