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3 years ago

I need help, can someone show me how to solve it

Mathematics

2 answers:

Anarel [89]3 years ago

5 0

Answer:

Step-by-step explanation:

Simply plug -3 in for x.

-2(-3)^2-7(-3)+6

(-3)^2=9

9*-2= -18

-7*-3=21

-18+21=3

3+6=9

vovangra [49]3 years ago

3 0

Answer:

f(-3) = 9

Step-by-step explanation:

Here we have a quadratic function in x: and we want to know the value of this function when x = -3.

Substituting -3 for x in f(x) = -2x^2 - 7x + 6, we get f(-3) = -2(-3)^2 - 7(-3) + 6, which works out to f(-3) = -2(9) + 21 + 6, or

f(-3) = -18 + 27 = 9

Thus, f(-3) = 9

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3 years ago

What is the average rate of change for h(t) between t=0 and t=2

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Part a: Option D 18 feet per second

Part b: increasing

Solution:

Height $h(t)=-16 t^{2}+50 t+3$

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3 years ago

What is the answer to this system of equations? 2x - 3y= 21 and -6x + 2y = 7.

allsm [11]

answer:

x = - 9/2

y = -10

Step-by-step explanation:

make both equations look like y =

2x-3y=21 -> -3y= -2x+21 -> y = (-2x+21)/-3 -> y = 2/3x - 7

-6x + 2y = 7 -> 2y = 6x + 7 -> y = 3x + 7/2

now make the equations equal to each other (since they both equal y)

get x

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x = (3/7) -21/2

x = - 63/14

x = - 9/2

put it back in an equation to get y

y = 3x + 7/2

y = 3(-9/2) + 7/2

y = -27/2 + 7/2

y = -20/2

y = - 10

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