Answer:x=11 or x=-11
Step-by-step explanation: First, Use the FOIL method.
(x+5)(x+4)=9x+141
First: [tex]x^{2}[/tex]
Outer: 4x
Inner: 5x
Last: 5x4=20
Combine Like terms and write in standard form: [tex]x^{2}[/tex]+9x+20
Set up new equation:[tex]x^{2}[/tex]+9x+20=9x+141
Subtract 9x from both sides: [tex]x^{2}[/tex]+20=141
Subtact 20 from both sides: [tex]x^{2}[/tex]=121
Sqr root 121: [tex]\sqrt{121}[/tex] =11
Remeber a sqr root of a positive number can be positive and negative so x= 11 or -11
