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3 years ago

Evaluate the function f(x) = -3x² – 20 Find f(-9)

Mathematics

1 answer:

dexar [7]3 years ago

8 0

Answer:

f(-9) = -263

Step-by-step explanation:

Find f(-9) by plugging in -9 into the function, and simplifying it:

f(x) = -3x² - 20

f(-9) = -3(-9)² - 20

f(-9) = -3(81) - 20

f(-9) = -243 - 20

f(-9) = -263

So, the answer is f(-9) = -263

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mestny [16]

Answer:

The slopes are

$m1=\dfrac{2}{5}, m2=-\dfrac{5}{2}$

Therefore, the equations are equations of <u> Perpendicular Lines .</u>

Step-by-step explanation:

Given:

$y=\dfrac{2}{5}\times x + 1$ ......................Equation ( 1 )

$5x+2y=-4\\\\\therefore y = \dfrac{-5}{2}\times x-2$ ..............Equation ( 2 )

To Find:

Slope of equation 1 = ?

Slope of equation 2 = ?

Solution:

On comparing with slope point form

$y=mx+c$

Where,

m = Slope

c = y-intercept

We get

Step 1.

Slope of equation 1 = m1 = $\dfrac{2}{5}$

Step 2.

Slope of equation 1 = m2 = $-\dfrac{5}{2}$

Step 3.

Product of Slopes = m1 × m2 = $\dfrac{2}{5}\times -\dfrac{5}{2}=-1$

Product of Slopes = m1 × m2 = -1

Which is the condition for Perpendicular Lines

The slopes are

$m1=\dfrac{2}{5},m2=-\dfrac{5}{2}$

Therefore, the equations are equations of <u> Perpendicular Lines . </u>

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3 years ago

Evaluate the function f(x) = -3x² – 20 Find f(-9)​

Evaluate the function f(x) = -3x² – 20 Find f(-9)