Question

need work and explanations

Answer 1

Answer:

x =√y-4

Step-by-step explanation:

take 4 on Lhs and square root both the sides

and we are left with x on Rhs and shift it on lhs and √y-4 on Rhs and x is the subject

Answer 2

Step-by-step explanation:

y=x^2+4

x^2= y-4

taking x as a subject x=

$\sqrt{y - 4}$