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mylen [45]
3 years ago
5

How do u do this? 4-5x=2x+25

Mathematics
2 answers:
NARA [144]3 years ago
7 0

Answer:

x = -3

Step-by-step explanation:

Solve for x:

-5 x + 4 = 2 x + 25

Subtract 2 x from both sides:

(-5 x - 2 x) + 4 = (2 x - 2 x) + 25

-5 x - 2 x = -7 x:

-7 x + 4 = (2 x - 2 x) + 25

2 x - 2 x = 0:

-7 x + 4 = 25

Subtract 4 from both sides:

(4 - 4) - 7 x = 25 - 4

4 - 4 = 0:

-7 x = 25 - 4

25 - 4 = 21:

-7 x = 21

Divide both sides of -7 x = 21 by -7:

(-7 x)/(-7) = 21/(-7)

(-7)/(-7) = 1:

x = 21/(-7)

The gcd of 21 and -7 is 7, so 21/(-7) = (7×3)/(7 (-1)) = 7/7×3/(-1) = 3/(-1):

x = 3/(-1)

Multiply numerator and denominator of 3/(-1) by -1:

Answer:  x = -3

Aleonysh [2.5K]3 years ago
5 0

Answer:

x = -3

Step-by-step explanation:

=> 4-5x=2x+25

=> -5x-2x= 25-4

=> -7x = 21

=> x = -21/7

=> x = -3

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3 years ago
Help solve both of these questions
Effectus [21]
Let's solve for a.
p
x
=
x
3
−
4
x
2
+
a
Step 1: Flip the equation.
x
3
−
4
x
2
+
a
=
p
x
Step 2: Add -x^3 to both sides.
x
3
−
4
x
2
+
a
+
−
x
3
=
p
x
+
−
x
3
−
4
x
2
+
a
=
−
x
3
+
p
x
Step 3: Add 4x^2 to both sides.
−
4
x
2
+
a
+
4
x
2
=
−
x
3
+
p
x
+
4
x
2
a
=
−
x
3
+
p
x
+
4
x
2

Answer:
a
=
−
x
3
+
p
x
+
4
x
2
3 0
3 years ago
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