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Tresset [83]
2 years ago
8

Find the slope of the line passing through the vertex and the y-intercept of the quadratic function

Mathematics
2 answers:
strojnjashka [21]2 years ago
6 0

Find y intercept

  • y=5(0)²+20(0)-7
  • y=0-7
  • y=-7

Point(0,-7)

Find vertex

x coordinate

  • -b/2a
  • -20/10
  • -2

y coordinate

  • y=5(4)-40-7
  • y=-27

Vertex at (-2,-27)

Slope

  • m=(-27+7)/-2-0
  • m=-20/-2
  • m=10
allsm [11]2 years ago
5 0

Answer:

10

Step-by-step explanation:

<h3><u>Vertex</u></h3>

The <u>x-coordinate</u> of the vertex of a <u>quadratic equation</u> in the form

f(x)=ax^2+bx+c\quad \textsf{is} \quad -\dfrac{b}{2a}

<u>Given function</u>:

f(x)=5x^2+20x-7

\implies a=5, \quad b=20, \quad c=-7

<u>x-coordinate of the vertex</u>

\implies -\dfrac{b}{2a}=-\dfrac{20}{2(5)}=-2

To find the <u>y-coordinate of the vertex</u>, substitute the found value of x into the function:

\begin{aligned}\implies f(-2) & =5(-2)^2+20(-2)-7\\& = 5(4)-40-7\\& = 20-47\\& = -27\end{aligned}

Therefore, the coordinates of the vertex are (-2, -27).

<h3><u>y-intercept</u></h3>

The y-intercept is when the curve <u>crosses the y-axis</u>, so when x = 0.

To find the y-coordinate of the y-intercept, substitute x = 0 into the function:

\begin{aligned}\implies f(0) & =5(0)^2+20(0)-7\\& = 0 + 0-7\\& = -7\end{aligned}

Therefore, the coordinates of the y-intercept are (0, -7).

<h3><u>Slope</u></h3>

To find the slope of the line passing through the <u>vertex</u> and the <u>y-intercept</u>, simply substitute the found points into the slope formula:

\implies \sf slope=\dfrac{change\:in\:y}{change\:in\:x}=\dfrac{-27-(-7)}{-2-0}=\dfrac{-20}{-2}=10

Therefore, the slope of the line passing through the vertex and the y-intercept of the given quadratic function is 10.

Learn more about slopes here:

brainly.com/question/27781455

brainly.com/question/27275173

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