solve this plz
√(x^(2)-3x) = 4x^(2)- 12 x
leave answer in square root

Question

solve this plz
√(x^(2)-3x) = 4x^(2)- 12 x
leave answer in square root

anonymous · Answer

Have you tried squaring both sides of the equation and calling x^2=s and solving the second order equation for s as you normaly do and taking the square root of s?

anonymous · Answer

oh forget it, there are terms of order 1 and 3 so it wouldn't work

anonymous · Answer

aha, found it. Call x^2-3x=y then the equation gets like this: $$\sqrt{y} = 4y$$Solve for y, then solve for x knowing y

wwe123 · Answer

it means √(y)=4y-12

anonymous · Answer

No, only 4y because the right hand side is 4 times whats in the square root

wwe123 · Answer

sorry question is √(x^(2)-3x) = 4x^(2)- 12x - 3

anonymous · Answer

Then it is $$\sqrt{y}=4y-3$$

wwe123 · Answer

√(x^(2)-3x) = 4x^(2)- 12- 3x

wwe123 · Answer

√(x^(2)-3x) = 4x^(2)- 12x - 3 (wrong)

anonymous · Answer

Well then I guess my sugestion does not help.

anonymous · Answer

Are you sure it is right? Because I tried putting it into mathematica and the exact solution was HUGE.