Divide using long division. State the quotient, and the remainder, $r\left(x\right)$. $\frac{2x^3 + 7x^2 + 9x - 20}{x + 3}$

Verified step by step guidance

1. Identify the dividend and divisor. Here, the dividend is \$2x^{3} + 7x^{2} + 9x - 20\( and the divisor is \)x + 3$.
2. Set up the long division by writing \$2x^{3} + 7x^{2} + 9x - 20\( under the division bar and \)x + 3$ outside.
3. Divide the leading term of the dividend, \$2x^{3}\(, by the leading term of the divisor, \)x\(, to get the first term of the quotient: \)2x^{2}$.
4. Multiply the entire divisor \(x + 3\) by \$2x^{2}$ and subtract the result from the dividend to find the new polynomial to bring down.
5. Repeat the process: divide the new leading term by \(x\), multiply the divisor by this term, subtract, and continue until the degree of the remainder is less than the degree of the divisor.

Key Concepts

Polynomial Long Division

Polynomial long division is a method used to divide one polynomial by another, similar to numerical long division. It involves dividing the leading term of the dividend by the leading term of the divisor, multiplying the divisor by this result, subtracting from the dividend, and repeating until the degree of the remainder is less than the divisor.

Quotient and Remainder in Polynomial Division

When dividing polynomials, the quotient is the polynomial result of the division, and the remainder is what is left over with a degree less than the divisor. The division can be expressed as Dividend = Divisor × Quotient + Remainder, which helps in understanding the relationship between these components.

Degree of a Polynomial

The degree of a polynomial is the highest power of the variable in the expression. In polynomial division, the process continues until the degree of the remainder is less than the degree of the divisor, ensuring the division is complete and the remainder cannot be further divided.