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Nataliya [291]
3 years ago
12

Z-6=15 what does z equal

Mathematics
2 answers:
Rainbow [258]3 years ago
8 0

Answer:

z=21

Step-by-step explanation:

z-6=15

add 6 on both side

-6+6=0

6+15=21

z=21

zmey [24]3 years ago
5 0

Answer:

z = 21

Step-by-step explanation:

z-6=15

z = 15 + 6

z = 21

hope it helps!

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Answer:

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Step-by-step explanation:

We need  2 numbers whose product is + 72 and whose sum = -17.

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What are the solutions?<br>8x^2-12x-23=-5​
erastova [34]

Answer:

x = 3/4 + (3 sqrt(5))/4 or x = 3/4 - (3 sqrt(5))/4

Step-by-step explanation:

Solve for x over the real numbers:

8 x^2 - 12 x - 23 = -5

Divide both sides by 8:

x^2 - (3 x)/2 - 23/8 = -5/8

Add 23/8 to both sides:

x^2 - (3 x)/2 = 9/4

Add 9/16 to both sides:

x^2 - (3 x)/2 + 9/16 = 45/16

Write the left hand side as a square:

(x - 3/4)^2 = 45/16

Take the square root of both sides:

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x = 3/4 + (3 sqrt(5))/4 or x - 3/4 = -(3 sqrt(5))/4

Add 3/4 to both sides:

Answer:  x = 3/4 + (3 sqrt(5))/4 or x = 3/4 - (3 sqrt(5))/4

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