Chapter 10: Problem 87
Simplify completely. Assume all variables represent positive real numbers. $$\sqrt{32 t^{5} u^{7}}$$
Short Answer
Expert verified
\(2^{\frac{5}{2}}t^{\frac{5}{2}}u^{\frac{7}{2}}\)
Step by step solution
01
Find the prime factors of the radicand
The radicand is \(32t^5u^7\). We can find its prime factors as follows:
For 32, its prime factors are \(2^5\).
For \(t^5\), its prime factors are already given.
For \(u^7\), its prime factors are already given.
Now, we can rewrite the expression as \(\sqrt{(2^5)(t^5)(u^7)}\).
#Step 2: Apply the square root to each factor#
02
Apply the square root
The square root will apply to each factor separately:
\(\sqrt{2^5}\times\sqrt{t^5}\times\sqrt{u^7}\)
#Step 3: Simplify the square roots#
03
Simplify the square root of each factor
Now we can simplify the square root of each factor:
\(\sqrt{2^5}\) = \(2^{\frac{5}{2}}\)
\(\sqrt{t^5}\) = \(t^{\frac{5}{2}}\)
\(\sqrt{u^7}\) = \(u^{\frac{7}{2}}\)
#Step 4: Combine the simplified results#
04
Combine the simplified factors
Now, we multiply all the simplified factors from step 3 together:
\(2^{\frac{5}{2}}\times t^{\frac{5}{2}}\times u^{\frac{7}{2}}\)
The simplified expression is:
\(2^{\frac{5}{2}}t^{\frac{5}{2}}u^{\frac{7}{2}}\)
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Prime Factorization
Prime factorization is a method that involves breaking down a number into its basic building blocks: prime numbers. A prime number is a number greater than 1 that has no other factors except for 1 and itself. For example, the number 32 can be factored as follows:
- 32 is even, so we can divide it by 2: 32 ÷ 2 = 16. Record the factor 2.
- 16 is also even, divide by 2 again: 16 ÷ 2 = 8. Record another 2.
- 8 is even, divide by 2 once more: 8 ÷ 2 = 4. Record another 2.
- 4 is even, divide by 2 again: 4 ÷ 2 = 2. Record another 2.
- Finally, 2 divided by 2 equals 1. Record the last 2.
Square Roots
A square root is the opposite operation of squaring a number. Squaring a number means to multiply it by itself, and taking the square root asks the question: what number, when multiplied by itself, gives this number? For example, \(\sqrt{9} = 3\), because \(3 \times 3 = 9\).When dealing with square roots in algebra, especially with integers raised to a power, it is important to understand how they interact:
- \(\sqrt{a^2} = a\)
- \(\sqrt{a^3} = a \cdot \sqrt{a}\)
- \(\sqrt{2^5} = 2^{5/2}\)
- \(\sqrt{t^5} = t^{5/2}\)
- \(\sqrt{u^7} = u^{7/2}\)
Exponents
Exponents are compact ways to express repeated multiplication. When you see a number or variable with an exponent, it tells you how many times to multiply that number or variable by itself. For example, \(3^4\) means \(3 \times 3 \times 3 \times 3\).In algebra, exponents follow specific rules and properties:
- \(a^m \cdot a^n = a^{m+n}\)
- \((a^m)^n = a^{m\cdot n}\)
- \(a^0 = 1\)
- \(2^{5/2}\)
- \(t^{5/2}\)
- \(u^{7/2}\)