Answer :
To find the product of [tex]\(\left(7 x^2\right)\left(2 x^3+5\right)\left(x^2-4 x-9\right)\)[/tex], you need to multiply the expressions together step by step.
### Step 1: Multiply the First Two Expressions
First, start by multiplying [tex]\((7x^2)\)[/tex] with [tex]\((2x^3 + 5)\)[/tex].
[tex]\[ 7x^2 \times (2x^3 + 5) \][/tex]
Distribute [tex]\(7x^2\)[/tex] into the binomial:
[tex]\[ = 7x^2 \times 2x^3 + 7x^2 \times 5 \][/tex]
[tex]\[ = 14x^5 + 35x^2 \][/tex]
### Step 2: Multiply the Result with the Third Expression
Now, take the result [tex]\((14x^5 + 35x^2)\)[/tex] and multiply it by the third expression [tex]\((x^2 - 4x - 9)\)[/tex].
[tex]\[ (14x^5 + 35x^2) \times (x^2 - 4x - 9) \][/tex]
Distribute each term in [tex]\((14x^5 + 35x^2)\)[/tex] across each term in [tex]\((x^2 - 4x - 9)\)[/tex].
1. Multiply [tex]\(14x^5\)[/tex] by each term in the second expression:
[tex]\[
\begin{align*}
& = 14x^5 \times x^2 = 14x^7, \\
& = 14x^5 \times (-4x) = -56x^6, \\
& = 14x^5 \times (-9) = -126x^5.
\end{align*}
\][/tex]
2. Multiply [tex]\(35x^2\)[/tex] by each term in the second expression:
[tex]\[
\begin{align*}
& = 35x^2 \times x^2 = 35x^4, \\
& = 35x^2 \times (-4x) = -140x^3, \\
& = 35x^2 \times (-9) = -315x^2.
\end{align*}
\][/tex]
### Step 3: Combine All Terms
Now, combine all the obtained terms:
[tex]\[ 14x^7 - 56x^6 - 126x^5 + 35x^4 - 140x^3 - 315x^2 \][/tex]
This gives you the final expanded polynomial.
### Step 1: Multiply the First Two Expressions
First, start by multiplying [tex]\((7x^2)\)[/tex] with [tex]\((2x^3 + 5)\)[/tex].
[tex]\[ 7x^2 \times (2x^3 + 5) \][/tex]
Distribute [tex]\(7x^2\)[/tex] into the binomial:
[tex]\[ = 7x^2 \times 2x^3 + 7x^2 \times 5 \][/tex]
[tex]\[ = 14x^5 + 35x^2 \][/tex]
### Step 2: Multiply the Result with the Third Expression
Now, take the result [tex]\((14x^5 + 35x^2)\)[/tex] and multiply it by the third expression [tex]\((x^2 - 4x - 9)\)[/tex].
[tex]\[ (14x^5 + 35x^2) \times (x^2 - 4x - 9) \][/tex]
Distribute each term in [tex]\((14x^5 + 35x^2)\)[/tex] across each term in [tex]\((x^2 - 4x - 9)\)[/tex].
1. Multiply [tex]\(14x^5\)[/tex] by each term in the second expression:
[tex]\[
\begin{align*}
& = 14x^5 \times x^2 = 14x^7, \\
& = 14x^5 \times (-4x) = -56x^6, \\
& = 14x^5 \times (-9) = -126x^5.
\end{align*}
\][/tex]
2. Multiply [tex]\(35x^2\)[/tex] by each term in the second expression:
[tex]\[
\begin{align*}
& = 35x^2 \times x^2 = 35x^4, \\
& = 35x^2 \times (-4x) = -140x^3, \\
& = 35x^2 \times (-9) = -315x^2.
\end{align*}
\][/tex]
### Step 3: Combine All Terms
Now, combine all the obtained terms:
[tex]\[ 14x^7 - 56x^6 - 126x^5 + 35x^4 - 140x^3 - 315x^2 \][/tex]
This gives you the final expanded polynomial.
