Solve the equation -1+ square root of (x-3)=7

I'll use ^(0.5) to indicate the square root.

-1 + (x-3)^(0.5) = 7 (next: adding 1 on both sides)
(x-3)^(0.5) = 8 (next: squaring both sides)
x-3 = 64 (next: adding 3 on both sides)
x = 67

Test:
- 1 + (67-3)^(0.5) = -1 + (64)^(0.5) = - 1+ 8 = 7

x=67

You can use wolframalpha.com for all math problems. However you may need to add extra parentheses to make it work

I made your equation
-1+ (square root of (x-3))=7
instead of the original in order to make the website work.