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alexandr1967 [171]
3 years ago
10

Help with functions?

Mathematics
1 answer:
ivolga24 [154]3 years ago
5 0

Answer:

The function g(x) = - x² + 14x + 39 is at a minimum when x = 7 is not true i.e. false.

Step-by-step explanation:

The function is given to be g(x) = - x² + 14x + 39 .......... (1)

Now, the condition for maxima or minima is g'(x) = \frac{dg(x)}{dx} = 0.

Now, differentiating equation (1) we get, g'(x) = - 2x + 14 ........ (2)

Hence, for maxima or minima g'(x) = 0 = - 2x + 14

⇒ x = 7

Now, from equation (2) and differentiating both sides with respect to x again g"(x) = \frac{d^{2}g(x) }{dx^{2} } = -2 < 0

Therefore,the function g(x) has maxima at x = 7

Therefore, the function g(x) = - x² + 14x + 39 is at a minimum when x = 7 is not true i.e. false.

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The graph of y = f(x) is shown below. What are all of the real solutions of f(x) = 0?
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Answer:

-8 and -2

Step-by-step explanation:

f(x) basically means y and at the y value 0 the x values are -8 and -2 (also known as the roots of the function)

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Oksanka [162]

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3 years ago
PLEASE HELP MEEEEE
ElenaW [278]

Answer:

  t ≥ -12

Step-by-step explanation:

Divide the inequality by the coefficient of t. Because that value is negative, the sign gets reversed.

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5 0
3 years ago
△DEF is shown below.<br><br>Triangle DEF<br><br>What is m∠DEF?​
S_A_V [24]

Answer:

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3y + 4 = 5y - 10

subtract 4 from both sides

3y = 5y - 14

subtract 5y from both sides

-2y = -14

divide by -2

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Add 7 into the equations:

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4 0
3 years ago
A square with side lengths of 3 cm is reflected vertically over a horizontal line of reflection that is 2 cm below the bottom ed
oksian1 [2.3K]

Answer:

a) 4 cm

b) 5 cm

c) 10 cm

Step-by-step explanation:

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Hope it helps <3

5 0
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