There is a step missing from the solution below. Which equation is the missing step?

Question

P = 46 - sqrt (0.042x+16)

28 = 46 - sqrt (0.042x +16)

-18 = -sqrt (0.042x + 16)

                ?

308 = 0.042x

7333 = x

 

 

A. 324 = 0.042x + 256

B. 324 = 0.042x + 16

C. 308 = 0.042x + 16

D. 324 = sqrt (0.042x +16)

Answer 1

So the difference between the 3rd and 5th line is that the sqrt is gone. So to get rid of a square root, you would square it. Squaring the square root removes the square root giving you only (0.042x+16) and since you have to do the exact same thing to the other side, squaring (-18) gives positive 324. So the missing line will be 324=(.042x+16) or B.