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borishaifa [10]
3 years ago
8

Someone please help me with these three problems, I really need to get my grade up

Mathematics
1 answer:
sergiy2304 [10]3 years ago
5 0

81=16x²+24x+9

72=8(2x²+3x)

9=2x²+3x

0=2x²+3x-9

0=(2x-3)(x+3)

X=3/2 or -3

18=36x²+12x+1

0=36x²+12x-17

x=(-12±√(144-4(36)(-17))/2(36)

X=0.54 or 0.874

28=25x²+40x+16

0=25x²+40x-12

X=(-40±√(40²-4(25)(-12))/2(25)

X=-1.858 or 0.258

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TiliK225 [7]

Answer:

x = -2,-3

Step-by-step explanation:

Solve the equation by factorizing.

To factorize this equation, you have to find the two numbers that adds up to 5 and multiplies to 6.

This one is obvious, but for others you may use trial and error.

After finding the 2 numbers: 2 and 3.

Present them in this format:

(x+3) ( x+2) = 0

You may check if this is correct using the distribution method.

After this,

you have to solve it individually.

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x = -3

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x = -2.

Thus, x has 2 different values: -3, -2.

You may check this by substituting x with either of these values.

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5 0
3 years ago
last week rafael drove m miles. this week he drove 153 miles. using m, write an expression for the total number of miles he drov
zzz [600]

The expression for the total number of miles he drove in the two weeks is m + 153

<h3>How to determine the expression for the total number of miles he drove in the two weeks?</h3>

The given parameters are

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The expression for the total number of miles he drove in the two weeks is

Expression = Last week + This week

This gives

Expression = m + 153

Hence, the expression for the total number of miles he drove in the two weeks is m + 153

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1 year ago
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Katena32 [7]
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3 years ago
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Anastaziya [24]

Answer:

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Step-by-step explanation:

A. 12x² + 15

B. 20x² + 25

C. 12x² + 8x + 25

D. 24x² + 16x + 50

Hypotenuse = 8x²

Height = 4x² + 15

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Perimeter of the triangle = hypotenuse + height + base

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= 8x² + 4x² + 15 + 8x + 10

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C. 12x² + 8x + 25

7 0
3 years ago
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Albert walks home from school 5 days a week he walked a total of 4 1/6 miles how far did Albert walk each day
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Answer: 1.2 miles a day

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