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Which expression is equivalent to [tex]\left(4 x^3 y^5\right)\left(3 x^5 y\right)^2[/tex]?

A. [tex]24 x^{13} y^7[/tex]
B. [tex]36 x^{13} y^7[/tex]
C. [tex]36 x^{20} y^6[/tex]
D. [tex]144 x^{16} y^{12}[/tex]


Sagot :

To determine which expression is equivalent to [tex]\(\left(4 x^3 y^5\right)\left(3 x^5 y\right)^2\)[/tex], let's break it down step by step.

1. Simplify the expression inside the parentheses:

[tex]\(\left(3 x^5 y\right)^2\)[/tex]

When an expression is squared, you raise each part of the expression to the power of two. Thus:

[tex]\[ (3 x^5 y)^2 = 3^2 \cdot \left(x^5\right)^2 \cdot y^2 \][/tex]

Calculating each part:

- [tex]\(3^2 = 9\)[/tex]
- [tex]\(\left(x^5\right)^2 = x^{10}\)[/tex] (because [tex]\((a^m)^n = a^{mn}\)[/tex])
- [tex]\(y^2\)[/tex]

So:

[tex]\[ \left(3 x^5 y\right)^2 = 9 x^{10} y^2 \][/tex]

2. Multiply this result by the other term:

Now we need to multiply this by [tex]\(4 x^3 y^5\)[/tex]:

[tex]\[ \left(4 x^3 y^5\right) \cdot \left(9 x^{10} y^2\right) \][/tex]

We can combine the coefficients and the powers of [tex]\(x\)[/tex] and [tex]\(y\)[/tex] separately:

- Coefficients: [tex]\(4 \cdot 9 = 36\)[/tex]
- Powers of [tex]\(x\)[/tex]: [tex]\(x^3 \cdot x^{10} = x^{3+10} = x^{13}\)[/tex]
- Powers of [tex]\(y\)[/tex]: [tex]\(y^5 \cdot y^2 = y^{5+2} = y^7\)[/tex]

So:

[tex]\[ \left(4 x^3 y^5\right) \cdot \left(9 x^{10} y^2\right) = 36 x^{13} y^7 \][/tex]

3. Check the answer choices:

- [tex]\(24 x^{13} y^7\)[/tex]
- [tex]\(36 x^{13} y^7\)[/tex]
- [tex]\(36 x^{20} y^6\)[/tex]
- [tex]\(144 x^{16} y^{12}\)[/tex]

The correct expression is [tex]\(36 x^{13} y^7\)[/tex].

Therefore, the expression that is equivalent to [tex]\(\left(4 x^3 y^5\right)\left(3 x^5 y\right)^2\)[/tex] is [tex]\(\boxed{36 x^{13} y^7}\)[/tex].