Factor -7x3 + 21x2 + 3x - 9 by grouping. What is the resulting expression?

Mathematics

1 answer:

irga5000 [103]3 years ago

8 0

Answer:

$(x-3)(-7x^2+3)$ is the resulting expression after grouping

Step-by-step explanation:

Given:

$-7x^3+21x^2+3x-9$

Now taking common $-7x^2$ from 1st 2 numbers and and 3 common from last we get

$-7x^2(x-3)+3(x-3)$

Now taking x-3 common from both numbers we get

$(x-3)(-7x^2+3)$ which is the final equation after grouping

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elena-s [515]

Answer:

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Step-by-step explanation:

Taking a look at the question, try to break it down into these general steps:

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2 years ago

The Baldwin family walked of a mile in of an hour. What is their unit rate in miles per hour? (5 points)

Lisa [10]

So walked 4/5 mile in a 4/9 h so just use the rule of 3 simple

60 minutes ------ 1 hour
x min. ----------- 4/9 h
--------------------------------
x = 4/9 *60/1 = 240/9 = 26,6 min.

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1 mile -------- x min.
-----------------------------
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1 mile ..... 33,25 min.
x miles ----- 60 min.
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x = 60/33,25 = 1,8 miles

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hope this will help you.

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3 years ago

Brock is a plumber. He charges a flat rate of $40 to visit a house to inspect its plumbing. He charges an additional $20 for eve

GalinKa [24]

Let x = hours of service.
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The charge per hour is $20.

Brock's charges for x hours is
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This is a straight line with slope = 20 and y-intercept = 40.
The correct graph is W.

Answer: W