Solve the Square Root Equation: Finding X in √6x = √36

Square Root Equations with Radical Simplification

Solve for x:

6x=36 \sqrt{6}x=\sqrt{36}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's find the value of X.
00:09 First, we need to isolate X. This means getting X by itself in the equation.
00:18 Next, let's break down 36 into its factors: 6 times 6.
00:25 Remember, when multiplying the square root of a number A. By the square root of another number B.
00:31 The result is the square root of A times B. Together.
00:36 We'll apply this formula to our problem, and convert one square root to 2 for simplicity.
00:42 Now, simplify everything whenever possible.
00:46 And there you have it, this is our solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for x:

6x=36 \sqrt{6}x=\sqrt{36}

2

Step-by-step solution

To solve the equation 6x=36 \sqrt{6}x = \sqrt{36} , we will proceed with the following steps:

  • Step 1: Simplify the square root on the right-hand side.
    36=6\sqrt{36} = 6.
  • Step 2: Substitute the simplified value back into the equation to obtain:
    6x=6\sqrt{6}x = 6.
  • Step 3: Solve for x x by isolating the variable. Divide both sides by 6\sqrt{6}:
    x=66 x = \frac{6}{\sqrt{6}} .
  • Step 4: Simplify the fraction:
    Multiply the numerator and denominator by 6\sqrt{6}:
    x=6×66×6=666=6 x = \frac{6 \times \sqrt{6}}{\sqrt{6} \times \sqrt{6}} = \frac{6 \sqrt{6}}{6} = \sqrt{6} .

Therefore, the solution to the equation is x=6 x = \sqrt{6} .

3

Final Answer

6 \sqrt{6}

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Always simplify square roots first: 36=6 \sqrt{36} = 6
  • Isolation: Divide both sides by 6 \sqrt{6} to get x=66 x = \frac{6}{\sqrt{6}}
  • Rationalization: Multiply by 66 \frac{\sqrt{6}}{\sqrt{6}} to get x=6 x = \sqrt{6}

Common Mistakes

Avoid these frequent errors
  • Squaring both sides immediately without simplifying
    Don't square both sides right away = 6x=36 6x = 36 which gives x=6 x = 6 ! This changes the original equation structure and ignores the coefficient 6 \sqrt{6} . Always simplify square roots first, then isolate the variable by division.

Practice Quiz

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Choose the largest value

FAQ

Everything you need to know about this question

Why can't I just square both sides to eliminate the square roots?

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Squaring both sides changes the equation! The left side becomes 6x2 6x^2 , not 6x 6x . Only square when you have isolated square root terms on one side.

What does it mean to rationalize the denominator?

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Rationalizing means removing square roots from the denominator. Multiply both numerator and denominator by 6 \sqrt{6} to get 666=6 \frac{6\sqrt{6}}{6} = \sqrt{6} .

How do I check if x=6 x = \sqrt{6} is correct?

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Substitute back: 66=36=6 \sqrt{6} \cdot \sqrt{6} = \sqrt{36} = 6 . Since 36=6 \sqrt{36} = 6 , both sides equal 6, so our answer is correct!

Why is the answer 6 \sqrt{6} and not 6?

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Because we have 6 \sqrt{6} as a coefficient multiplying x. When we divide 6 by 6 \sqrt{6} , we get 6 \sqrt{6} , not 6.

Can I leave my answer as 66 \frac{6}{\sqrt{6}} ?

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While mathematically correct, it's better practice to rationalize denominators. Most teachers prefer the simplified form 6 \sqrt{6} as the final answer.

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