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elena-s [515]
3 years ago
7

I need Help please! Evaluate the "expression" for a= -1, b= 9 and c= -2. b^2–4ac.

Mathematics
2 answers:
MatroZZZ [7]3 years ago
5 0

Answer

b²-4ac. When a= -1 b= 9 c= -2

Substitute the values a,b and c in the equation

=9²-4(-1)(-2)

=81-4(2) note that -1*-2= 2

=81-8

=73

anyanavicka [17]3 years ago
4 0

Answer:

-170

Step-by-step explanation:

- 2(9)^2-4(-1)(-2)

-2(81)-4(2)

-162-8

-170

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Answer:

B= x=4

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If a is three times b, b is twice c, and c is four times d, what is the value of a*c/b*d
dsp73

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12

Step-by-step explanation:

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d = -19

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Using adding and substitution to find the value of x for the set of equations x-y=120 x+y=150
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the pressure, P, of a gas varies inversely with its volume, V. pressure is measured in units of PA. Suppose that a particular am
miss Akunina [59]

The pressure is 39 Pa if the volume is expanded to 168L and the pressure, P, of a gas varies inversely with its volume, V.

<h3>What is a proportional relationship?</h3>

It is defined as the relationship between two variables when the first variable increases, the second variable also increases according to the constant factor.

We have:

The pressure, P, of a gas varies inversely with its volume, V.

P ∝ 1/V

P = k/V

k is the constant.

If P = 126 Pa and V = 52 L

126 = k/52

k = 6552

P = 6552/V

Plug V = 168 L

P = 6552/168 = 39 Pa

Thus, the pressure is 39 Pa if the volume is expanded to 168L and the pressure, P, of a gas varies inversely with its volume, V.

Learn more about the proportional here:

brainly.com/question/14263719

#SPJ1

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