Question

How the equation $\sqrt{x}=4$ can be made linear? (where $x\ge 0$)

• A. Substitute $x=u^2$, now the equation is linear in variable $x$
• B. Substitute $x=u^3$, now the equation is linear in variable u
• C. Substitute $x=u^2$, now the equation is linear in variable u
• D. Substitute $x=u^4$, now the equation is linear in variable u

Answer 1

The correct option is C Substitute $x=u^2$, now the equation is linear in variable u

The equation is not linear. We will substitute
$x=u^2$.
Now, the equation is u = 4 which is linear equation.