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Assuming 
x and 
y are both positive, write the following expression in simplest radical form.

7x^(3)y^(2)sqrt(45x^(5)y^(4))
Answer:

Assuming x x and y y are both positive, write the following expression in simplest radical form.\newline7x3y245x5y4 7 x^{3} y^{2} \sqrt{45 x^{5} y^{4}} \newlineAnswer:

Full solution

Q. Assuming x x and y y are both positive, write the following expression in simplest radical form.\newline7x3y245x5y4 7 x^{3} y^{2} \sqrt{45 x^{5} y^{4}} \newlineAnswer:
  1. Identify Parts for Simplification: Identify the parts of the expression that can be simplified.\newlineWe have the expression 7x3y245x5y47x^{3}y^{2}\sqrt{45x^{5}y^{4}}. The square root can be simplified by taking out factors that are perfect squares.
  2. Simplify Square Root: Simplify the square root. 45x5y4\sqrt{45x^{5}y^{4}} can be broken down into 9×5×x4×x×y4\sqrt{9 \times 5 \times x^{4} \times x \times y^{4}}. Since 99, x4x^{4}, and y4y^{4} are perfect squares, we can take the square root of these separately. 9=3\sqrt{9} = 3, x4=x2\sqrt{x^{4}} = x^{2}, and y4=y2\sqrt{y^{4}} = y^{2}. So, 45x5y4=3x2y25x\sqrt{45x^{5}y^{4}} = 3x^{2}y^{2}\sqrt{5x}.
  3. Combine Simplified Terms: Combine the simplified square root with the rest of the expression.\newlineNow we have 7x3y2×3x2y25x7x^{3}y^{2} \times 3x^{2}y^{2}\sqrt{5x}.\newlineMultiplying the coefficients (77 and 33) and the like terms (x3x^{3} and x2x^{2}, y2y^{2} and y2y^{2}) gives us:\newline7×3×x3+2×y2+2×5x=21x5y45x7 \times 3 \times x^{3+2} \times y^{2+2} \times \sqrt{5x} = 21x^{5}y^{4}\sqrt{5x}.
  4. Check for Further Simplifications: Check for any further simplifications.\newlineThe expression 21x5y45x21x^{5}y^{4}\sqrt{5x} is already in its simplest radical form. There are no further simplifications that can be made since 5x5x is not a perfect square and cannot be taken out of the square root.

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