Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

Express the following fraction in simplest form, only using positive exponents.

(5(r^(4))^(3))/(-20r^(-3))
Answer:

Express the following fraction in simplest form, only using positive exponents.\newline5(r4)320r3 \frac{5\left(r^{4}\right)^{3}}{-20 r^{-3}} \newlineAnswer:

Full solution

Q. Express the following fraction in simplest form, only using positive exponents.\newline5(r4)320r3 \frac{5\left(r^{4}\right)^{3}}{-20 r^{-3}} \newlineAnswer:
  1. Identify negative exponent: Write down the given expression and identify the negative exponent.\newlineThe given expression is (5(r4)3)/(20r3)(5(r^{4})^{3})/(-20r^{-3}).\newlineWe have a negative exponent in the denominator which is r3r^{-3}.
  2. Apply power of power rule: Apply the power of a power rule to the numerator.\newlineThe power of a power rule states that (am)n=amn(a^{m})^{n} = a^{m*n}.\newlineSo, (r4)3=r43=r12(r^{4})^{3} = r^{4*3} = r^{12}.\newlineNow the expression becomes (5r12)/(20r3)(5r^{12})/(-20r^{-3}).
  3. Convert negative exponent: Convert the negative exponent to a positive exponent by moving the term to the numerator.\newlineAccording to the exponent rules, an=1ana^{-n} = \frac{1}{a^n} when moving from the denominator to the numerator.\newlineSo, r3r^{-3} becomes r3r^{3} when moved to the numerator.\newlineNow the expression becomes (5r12r3)/(20)(5r^{12} \cdot r^{3})/(-20).
  4. Combine like terms: Combine the like terms in the numerator using the product of powers rule.\newlineThe product of powers rule states that am×an=am+na^{m} \times a^{n} = a^{m+n}.\newlineSo, r12×r3=r12+3=r15r^{12} \times r^{3} = r^{12+3} = r^{15}.\newlineNow the expression becomes (5r15)/(20)(5r^{15})/(-20).
  5. Simplify fraction: Simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor.\newlineThe greatest common divisor of 55 and 2020 is 55.\newlineDivide both the numerator and the denominator by 55.\newline55r15/205\frac{5}{5}r^{15} / \frac{-20}{5} = r15/(4)r^{15} / (-4).
  6. Make denominator positive: Since we cannot have a negative in the denominator, we can multiply the numerator and the denominator by 1-1 to make the denominator positive.\newlineMultiplying by 1-1, we get (1×r15)/(1×4)=r15/4(-1 \times r^{15}) / (-1 \times -4) = -r^{15} / 4.

More problems from Multiplication with rational exponents