To simplify the expression \((x^4)^3 (x^5)^2\), we can use the power rules for exponents, specifically:
- \((a^m)^n = a^{m \cdot n}\)
- \(a^m \cdot a^n = a^{m+n}\)
Now let's apply these rules step-by-step:
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First, simplify \((x^4)^3\): \[ (x^4)^3 = x^{4 \cdot 3} = x^{12} \]
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Next, simplify \((x^5)^2\): \[ (x^5)^2 = x^{5 \cdot 2} = x^{10} \]
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Now, combine the two results using the product rule: \[ x^{12} \cdot x^{10} = x^{12 + 10} = x^{22} \]
Therefore, the simplified expression in exponential form is: \[ \boxed{x^{22}} \]