Compare Expressions: Determine the Sign Between (1/25)(5² - 3 + √9) and √25·5·(1/5)

Expression Evaluation with Square Roots

Indicates the corresponding sign:

125⋅(52−3+9)☐25⋅5⋅15 \frac{1}{25}\cdot(5^2-3+\sqrt{9})\textcolor{red}{☐}\sqrt{25}\cdot5\cdot\frac{1}{5}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:14 Let's set the correct sign first.
00:18 We'll start with the left side of the problem.
00:21 First, always solve what's inside the parentheses.
00:27 Calculate 5 to the power of 2 using exponent rules.
00:32 Then, put this value back into the problem.
00:36 Next, find the square root of 9.
00:40 Substitute this value into the problem.
00:43 Remember, the square root of a number squared is the number it self.
00:48 Keep solving the expression, starting with the parentheses.
00:53 Any number divided by itself equals 1.
00:57 That's the solution for the left side.
01:01 Now, let's solve the right side of the exercise.
01:05 Find the square root of 25.
01:09 Insert this value back into the exercise.
01:13 Simplify wherever possible.
01:16 Remember, the square root of a number squared is the number it self.
01:21 That's the solution for the right side.
01:25 Our calculation shows that the sides are unequal.
01:29 And that's how we solve this question.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Indicates the corresponding sign:

125⋅(52−3+9)☐25⋅5⋅15 \frac{1}{25}\cdot(5^2-3+\sqrt{9})\textcolor{red}{☐}\sqrt{25}\cdot5\cdot\frac{1}{5}

2

Step-by-step solution

We solve the left side and start from the parentheses:

52=5×5=25 5^2=5\times5=25

We will solve the root exercise using the equation:a2=a \sqrt{a^2}=a

9=32=3 \sqrt{9}=\sqrt{3^2}=3

We arrange the exercise accordingly:

125×(25−3+3)= \frac{1}{25}\times(25-3+3)=

We solve the exercise in parentheses from left to right:

125×(22+3)=125×25 \frac{1}{25}\times(22+3)=\frac{1}{25}\times25

We convert the 25 into a simple fraction, multiply and divide:

125×251=2525=11=1 \frac{1}{25}\times\frac{25}{1}=\frac{25}{25}=\frac{1}{1}=1

We solve the right side:

25=52 \sqrt{25}=\sqrt{5^2}

We arrange the exercise:

52×5×15 \sqrt{5^2}\times5\times\frac{1}{5}

We convert the 5 into a simple fraction and note that it is possible to reduce by 5:

52×51×15=52×1 \sqrt{5^2}\times\frac{5}{1}\times\frac{1}{5}=\sqrt{5^2}\times1

We solve the root according to the formula:a2=a \sqrt{a^2}=a

5×1=5 5\times1=5

Now we are going to compare the left side with the right side, and it seems that we obtained two different results and therefore the two sides are not equal.

3

Final Answer

≠ \ne

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Solve parentheses, then square roots, then multiplication/division
  • Technique: Simplify 25=5 \sqrt{25} = 5 and 52=25 5^2 = 25 before multiplying
  • Check: Left side equals 1, right side equals 5, so 1 ≠ 5 ✓

Common Mistakes

Avoid these frequent errors
  • Skipping the order of operations inside parentheses
    Don't solve multiplication before addition inside parentheses = wrong calculations! This changes the entire value and leads to incorrect comparisons. Always follow PEMDAS: solve everything inside parentheses first, then exponents and roots, then multiply/divide from left to right.

Practice Quiz

Test your knowledge with interactive questions

\( 20\div(4+1)-3= \)

FAQ

Everything you need to know about this question

Why do I need to solve the parentheses completely before multiplying by 1/25?

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The order of operations (PEMDAS) requires you to finish everything inside parentheses first. If you multiply by 1/25 too early, you'll get the wrong answer!

How do I know when square roots are simplified correctly?

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Look for perfect squares under the radical sign. Since 9=32=3 \sqrt{9} = \sqrt{3^2} = 3 and 25=52=5 \sqrt{25} = \sqrt{5^2} = 5 , these simplify to whole numbers.

What does the red box symbol mean in the question?

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The red box ☐ is where you choose the correct comparison symbol: either = (equals) or ≠ (not equal). You need to calculate both sides to determine which symbol is correct.

Can I use a calculator for these calculations?

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Yes, but make sure you understand each step! Practice doing these by hand first so you recognize patterns like 52=25 5^2 = 25 and common square roots.

Why is 5 × (1/5) equal to 1?

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When you multiply a number by its reciprocal (flip the fraction), you always get 1. Think of it as: 5×15=55=1 5 \times \frac{1}{5} = \frac{5}{5} = 1

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