Solved on Feb 10, 2024

Simplify the expression (x2+5)÷(x1)(x^{2}+5) \div(x-1) and select the correct answer.

STEP 1

Assumptions
1. We are given a rational expression (x2+5)÷(x1)(x^{2}+5) \div (x-1).
2. We need to perform polynomial long division or simplify the expression to match one of the given answer choices.

STEP 2

Begin the polynomial long division process by dividing the first term of the numerator by the first term of the denominator.
x2x=x\frac{x^{2}}{x} = x

STEP 3

Multiply the entire divisor (x1)(x-1) by the result from the previous step xx.
x(x1)=x2xx \cdot (x-1) = x^{2} - x

STEP 4

Subtract the result of the multiplication from the original numerator.
x2+5(x2x)=x2+5x2+x=x+5 \begin{align*} x^{2} + 5 - (x^{2} - x) &= x^{2} + 5 - x^{2} + x \\ &= x + 5 \end{align*}

STEP 5

Now, we have a new expression to divide by (x1)(x-1), which is x+5x + 5.

STEP 6

Divide the first term of the new expression by the first term of the divisor.
xx=1\frac{x}{x} = 1

STEP 7

Multiply the entire divisor (x1)(x-1) by the result from the previous step 11.
1(x1)=x11 \cdot (x-1) = x - 1

STEP 8

Subtract the result of the multiplication from the new expression.
x+5(x1)=x+5x+1=6 \begin{align*} x + 5 - (x - 1) &= x + 5 - x + 1 \\ &= 6 \end{align*}

STEP 9

The result 66 is the remainder of the division, since it cannot be divided by (x1)(x-1) without resulting in a fraction.

STEP 10

Combine the quotient obtained from the division with the remainder over the divisor to write the final answer.
Quotient+RemainderDivisor=x+1+6x1 \begin{align*} Quotient + \frac{Remainder}{Divisor} &= x + 1 + \frac{6}{x-1} \end{align*}

STEP 11

Compare the final answer with the given options.
The correct answer is option c, which is: (x+1)+6x1 (x+1)+\frac{6}{x-1}

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