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3 years ago

What is the value of 3x^2+4x+12 when x=-2

Mathematics

2 answers:

zepelin [54]3 years ago

6 0

Answer:

Step-by-step explanation:

3 x -2^2 + 4 x -2 + 12

first do exponents -2 x -2 = 4

3 x 4 + 4 x -2 + 12

Next do multiplication or division from left to right

12 - 8 + 12

now do subtraction or addition from left to right

4 + 12

irina [24]3 years ago

3 0

56 is the answer to the equation

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marshall27 [118]

Answer:

A. 1 > -1

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D. 16< 14

Step-by-step explanation:

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3 years ago

two trains leave stations 210 miles apart at the same time and travel tword each other. one train at 85 miles per hour while the

hodyreva [135]

recall your d = rt, distance = rate * time.

let's say we have two trains, A and B, A is going at 85 mph and B at 65 mph.

they are 210 miles apart and moving toward each other, at some point they will meet, when that happens, the faster train A has covered say d miles, and the slower B has covered then the slack from 210 and d, namely 210 - d.

When both trains meet, A has covered more miles than B because A is faster, however the time both have been moving, is the same, say t hours.

$\bf \begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ \textit{Train A}&d&85&t\\ \textit{Train B}&210-d&65&t \end{array}\\\\ \dotfill\\\\ \begin{cases} \boxed{d}=85t\\ 210-d=65t\\[-0.5em] \hrulefill\\ 210-\boxed{85t}=65t \end{cases} \\\\\\ 210=150t\implies \cfrac{210}{150}=t\implies \cfrac{7}{5}=t\implies \stackrel{\textit{one hour and 24 minutes}}{1\frac{2}{5}=t}$

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3 years ago

4x+y=10 ( ?,-6) <br><br> Find the missing value. Show all work.

ivann1987 [24]

Answer:

(4 , -6) x = 4.

Step-by-step explanation:

Note that in a pair under ( X , Y) always consists of X as it's 1st element and Y as it's second element.

so now we know that ( ? , -6) has an X value which is unknown.

inorder to find X you'll simply need to use the Y value you're given which is Y = -6 from ( ? , -6)

now plot the y value into the equation

4X + Y = 10 , Y = -6

4X + (-6) = 10

4X + - 6 = 10 ...... we know that A + - B = A - B

4X - 6 = 10

now take -6 to the right side

when -6 is taken to the right side, it changes to +6

and so ..

4X = 10 + 6

4X = 16

now divide both sides by 4 to find X

4X / 4 = 16 / 4

4 the coefficient of X which is 4 cancels with out denominator which is now 4

X = 16 / 4

16 ÷ 4 = 4.

5 0

2 years ago

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8_murik_8 [283]

Answer:

The area is 480 inches

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3 years ago

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Alex73 [517]

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Step-by-step explanation:

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3 years ago