Answer:
B
Step-by-step explanation:
Subtract 20 from both sides:
[tex]-\sqrt{9-8x} =-15[/tex]
Divide both sides by -1:
[tex]\sqrt{9-8x} =15[/tex]
Square both sides:
[tex]9-8x=255[/tex]
Subtract 9 by both sides:
[tex]-8x=216[/tex]
Divide both sides by -8:
[tex]x=-27[/tex]
That means that either a or b is correct and since 9/8 is positive that means it needs to bee less than 9/8 so the correct answer is B
