Solve: -8√(5x-5)=-3
A: -5
B: 5
C: 6
D: -6

Question

Solve: -8√(5x-5)=-3
A: -5
B: 5
C: 6
D: -6

anonymous · Answer

OH! I figured it out, I just forgot to put the + sign after the -8, that's why I was confused.

australopithecus · Answer

so you know how to deal with radicals then?

anonymous · Answer

Yup, just made a silly math error. Thanks for your help, though!

imtiaz7 · Answer

first take the -8 under the 3 and then squrae on both side in this you can solve easly.

australopithecus · Answer

First realize that,

$$\sqrt{x} = x^{\frac{1}{2}}$$

so we can write your problem as follows,

$$-8(5x-5)^{\frac{1}{2}} = -3$$

you need to eliminate the radical to solve for x, to do this you need to raise both sides of the equation by a certain power that will give you a 1 or a whole number.

For example

$$x^{\frac{1}{3}} = 12$$
can be solved by raising both sides to the power 3
$$(x^{\frac{1}{3}})^3 = 12^3$$
$$x^{\frac{1}{3}*3} = 12^3$$
$$x^{\frac{1*3}{3}} = 12^3$$
$$x^{\frac{3}{3}} = x^1 = x = 12^3$$