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nignag [31]
3 years ago
6

Find the difference quotient

mula1" title="\frac{f(x + h) - f(x)}{h}" alt="\frac{f(x + h) - f(x)}{h}" align="absmiddle" class="latex-formula"> for the following function. f(x) = -x^2 -3x + 1
Mathematics
2 answers:
AlladinOne [14]3 years ago
8 0

Answer:

-2x - h - 3

Step-by-step explanation:

Step 1: Define

Difference Quotient: \frac{f(x+h)-f(x)}{h}

f(x) = -x² - 3x + 1

f(x + h) means that x = (x + h)

f(x) is just the normal function

Step 2: Find difference quotient

  1. <u>Substitute:</u> \frac{[-(x+h)^2-3(x+h)+1]-(-x^2-3x+1)}{h}
  2. <u>Expand and Distribute:</u> \frac{[-(x^2+2hx+h^2)-3x-3h+1]+x^2+3x-1}{h}
  3. <u>Distribute:</u> \frac{-x^2-2hx-h^2-3x-3h+1+x^2+3x-1}{h}
  4. <u>Combine like terms:</u> \frac{-2hx-h^2-3h}{h}
  5. <u>Factor out </u><em><u>h</u></em><u>:</u> \frac{h(-2x-h-3)}{h}
  6. <u>Simplify:</u> -2x - h - 3

andrew-mc [135]3 years ago
4 0

Hey there!

We know that formula for the difference quotient is [ \frac{f(x+h)-f(x)}{h} ]

We need to find f(x + h), so use (x + h) instead of x.

f(x + h) → -(x + h)² because we are given [ -x² ]

-3(h + x) + 1 because we are given [ -3x + 1 ]

Put what we found into the formula and simplify.

\frac{(-(h+x)^2-3(h+x)+1-(x^2-3x+1)}{h}

-h-2x-3

Therefore, the difference quotient for the given function is [ -h - 2x - 3 ]

Best of Luck!

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