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Natalka [10]
3 years ago
12

Simply (3x³ + 2x-3) - (4x³ - x² + x)​

Mathematics
1 answer:
Vinvika [58]3 years ago
6 0

Answer:

\left(3x^3+2x-3\right)-\left(4x^3-x^2+x\right)=-x^3+x^2+x-3\\\mathrm{Remove\:parentheses}:\quad \left(a\right)=a\\3x^3+2x-3-\left(4x^3-x^2+x\right)\\3x^3+2x-3-4x^3+x^2-x\\-x^3+x^2+x-3

I hope this is good enough:

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Twice a number is 12 more than 5 times the number.
stira [4]

Answer:

  • -4

Step-by-step explanation:

<u>Let the number be x:</u>

  • 2x = 5x + 12
  • 2x - 5x = 12
  • -3x = 12
  • x = -4

It is -4

5 0
3 years ago
A straight line, L, is perpendicular to the straight line y=2x-1 and passes through the point (8,1). Find an equation of L
luda_lava [24]
Let's call that other line with the eqn. y=2x-1 line M.
This line is in slope-intercept form, which means that it is written in the form y=mx+b where m is the slope and b is the y-intercept.
This means that the slope of line M is 2.

Perpendicular lines have slopes which are opposite reciprocals.
(that is to say, if you flipped the fraction and changed the sign)

Of course, 2 isn't a fraction, but it's implied as 2/1.
The opposite reciprocal would then be -1/2.
Let's plug this into our slope-intercept form equation for line L.

y = mx + b
y = -1/2x + b

Of course, we still need to find that y-intercept. (y when x = 0)
To do this, we need to interpret the slope.
Slopes are rise over run, so m = -1/2 means a change of -1 in y = 2 in x.
Let's take a point we know is in our line, (8, 1).
To find that y-intercept, we want x to be 0.
To do this, we'd have to subtract 8 from x.
And according to our slope, this means adding 4 to y.
Our y-intercept is at (0, 5), with the value b that we use being just 5.

\boxed{y=-\frac{1}2x+5}
7 0
3 years ago
Which expression is equivalent to 9 x squared minus 2 y + 3 x squared minus 3 y?
lyudmila [28]

Answer:

The correct answer is 11 x squared + 2 y + x squared minus 3 y

Step-by-step explanation:

Just took the test on Edg. Hope it helps :)

8 0
3 years ago
Read 2 more answers
Answer these two please!!
Gala2k [10]

Answer:

#1: x/4 - 3/4

#2: x/14 + 9/2

Step-by-step explanation:

because i said so, you should mark me brainliest

7 0
3 years ago
If George received $ 78.00 for his work at Weaver's Store, and he was paid $ 6.00 per hour, how many hours did he work?
mihalych1998 [28]
13 hours
78.00 ÷ 6.00 equals 13 hours
6×13 equals 78
3 0
3 years ago
Read 2 more answers
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