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expeople1 [14]
3 years ago
10

Find the expression x = -7 x2 -1 / x+4

Mathematics
1 answer:
ELEN [110]3 years ago
7 0
Please confirm the question is x = (-7x^2 - 1) / (x + 4)

if that is the case, then

x * (x + 4) = -7x^2 - 1

x^2 + 4x = -7x^2 -1

8x^2 + 4x + 1 = 0

which does not have any real solution


Edit - much easier question to evaluate the expression (x^2 -1) / (x + 4) when x=-7

(-7^2 - 1) / (-7 + 4)

= (49 -1 ) / -3

= 48 / -3

= -16


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Which ordered pairs could be points on a line parallel to the line that contains (3, 4) and (–2, 2)? Check all that apply. (–2,
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(–1, 1) and (–6, –1)

(1, 0) and (6, 2)

(3, 0) and (8, 2)

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Slope of line having points (x1, y1) and (x2,y2) is given by (y2-y1)/(x2-x1)

Two lines with slope m1 and m2 are parallel if there slopes are equal i.e m1 = m2.

Slope of line  that contains (3, 4) and (–2, 2)

m = (2-4)/(-2-3) = -2/-5 = 2/5

__________________________________________

To find if other pair of lines lie on line parallel to  line  that contains (3, 4) and (–2, 2), we need to find slope for other pair of points , if those pairs have slopes as 2/5 then its clear that they lie on line parallel to  line  that contains (3, 4) and (–2, 2) else not.

Lets find slope of all the pairs

(–2, –5) and (–7, –3)

m1 = -3 -(-5)/-7-(-2) = -3+5/-7+2

m1 = 2/-5 = -2/5

as  -2/5 is not equal to 2/5, the mentioned points do not  lie on line parallel to  line  that contains (3, 4) and (–2, 2).

__________________________________________________

 

(–1, 1) and (–6, –1)

m2 = -1 -1)/-6-(-1) = -2/-6+1

m2 = -2/-5 = 2/5

as  2/5 is  equal to 2/5, the mentioned points do  lie on line parallel to  line  that contains (3, 4) and (–2, 2).

_________________________________________________

 

(0, 0) and (2, 5)

m3 = 5 -0)/2-0

m3 = 5/2

as   5/2 is not equal to 2/5, the mentioned points do not lie on line parallel to  line  that contains (3, 4) and (–2, 2).

_________________________________________________

 

(1, 0) and (6, 2)

m4 = 2 -0)/6-1

m4 = 2/5

as  m4

As m4 is  equal to 2/5, the mentioned points do  lie on line parallel to  line  that contains (3, 4) and (–2, 2).

_________________________________________________

 

(3, 0) and (8, 2)

m5 = 2 -0)/8-3

m5 = 2/5

as  m5 is  equal to 2/5, the mentioned points do  lie on line parallel to  line  that contains (3, 4) and (–2, 2).

______________________________________________

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(–1, 1) and (–6, –1)

(1, 0) and (6, 2)

(3, 0) and (8, 2)

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