question\nsimplify:\n(-10x^3)(4x^2)\nanswer attempt 1 out of 2

Explanation:

Step1: Multiply coefficients

Multiply - 10 and 4: $(-10)\times4=-40$.

Step2: Multiply variables

Use the rule $a^m\times a^n=a^{m + n}$ for $x^3\times x^2$. So $x^3\times x^2=x^{3 + 2}=x^5$.

Step3: Combine results

Combine the results of step 1 and step 2: $(-40)x^5=-40x^5$.

Answer:

$-40x^5$