Answer:
x=-9,9
Step-by-step explanation:
[tex]\frac{x^{2} +9}{x+9} =\frac{90}{x+9} \\[/tex]
Multiply each side by (x+9) to cancel out the denominators
[tex]x^2+9=90[/tex]
Subtract 9 from each side
[tex]x^2=81\\\sqrt{x^2} =\sqrt{81}[/tex]
Square root each side to cancel out the x^2
[tex]x=\frac{+}{-} 9[/tex]
