∴ 3x-4=5
x=3
2. The arithmetic square root of ∵ 9 is a, and the absolute value of b is 4.
∴a=3,b= 4
∴a-b=3-4=- 1
Or a-b=3-(-4)=7.
3. The arithmetic square root of ∵ 2a-1is 3, and the arithmetic square root of 3a+b- 1 is 4.
∴2a- 1=9,a=5
3a+b- 1= 16,b = 17-3a = 17- 15 = 2
4.√√( x-4)≥0,√(4-x)≥0
∴x-4≥0,x≥4
4-x≥0,x≤0
∴x=4
∴y=√(x-4)+√(4-x)+4=4
∴√x+√y=√4+√4
=2+2=4