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erma4kov [3.2K]
3 years ago
11

Solve the equation. Check your answer. 23 = 7x + 2 - 4x X= 1 (Simplify your answer.)

Mathematics
1 answer:
pychu [463]3 years ago
3 0

Answer:

7.

Step-by-step explanation:

23 = 7x + 2 - 4x

23 = 3x + 2

3x = 21

x = 7.

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The equation x2 − 9 = 0 has real solution(s).
tatiyna

Answer:

The roots are real and unequal (3, -3)

Step-by-step explanation:

x²-9=0

ax²+bx+c=0

Comparing we get,

a= 1

b= 0

c = -9

Determinant: b²-4ac

= 0² - 4(1)(-9)

= 36>0

D > 0

Therefore, the equation has real and unequal roots.

Algebraic identity:

x² - a² = (x-a)(x+a)

Using this identity

x²-9 = (x+3)(x-3)

Roots are 3 and -3 which are real and not equal to each other

Hope this answer helps you ..

6 0
3 years ago
Read 2 more answers
You need 23 yards of fabric to make five dresses. How many yards of fabric would be needed to make 8 dresses?
olasank [31]

Answer:

36.8 or 37 yards of fabric

Step-by-step explanation:

23 yards of fabric = five dresses

23 divided by five equals four point six

four point six multiplied by eight dress equals 36.8

23 yds of fabric = 5 dresses

23÷5=4.6

If you need to know how many yards of fabric, then you'd do:

4.6×8

4.6 is the amount of each yards 5 dresses are in and so if you times that by how many dresses you need now, you'll get:

36.8 yards of fabric

To round, it'd be 37 yards of fabric

5 0
2 years ago
Can someone help me with this problem?
masya89 [10]
5/7, I don't know what that is as a decimal, but I hope it helps
5 0
3 years ago
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Linear Patterns #2: Solving Equations
bixtya [17]

m=-4

you are subtracting all the numbers by 4 therefore they are all changing by -4

8 0
2 years ago
Which function has real zeros at x= -2 and x=5?
hammer [34]

x = -2, x = 5

=> f(x) = a(x+2)(x-5),  a ∈ R

3 0
3 years ago
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