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storchak [24]
3 years ago
12

Solve the equation by factoring. z2 − 6z − 27 = 0

Mathematics
1 answer:
Kisachek [45]3 years ago
7 0
The answer is x= 9 and -3

You must fine 2 number that multiply to equal -27 and add to equal -6

(x-9) (x+3)
Then equal the parts of the binomial to zero

x - 9 = 0
x + 3 = 0

You must get x by its self.
When you do so, you'll have the answer as -3 and 9
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Distribute the 1/4:
1/4(16x) + 1/4(20) - 7x

Do the multiplication:
1/4(16x) = 16x/4 = 4x
1/4 (20) = 20/4 = 5

Now you have:
4x + 5 - 7x = 0

Combine like terms (4x and -7x):
-3x + 5 = 0

Subtract 5 from both sides:
-3x = -5

Divide by -3:
x = -5/-3 = 5/3

Answer:
x= 5/3
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Answer:

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Step-by-step explanation:

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Hope this helps! :D

3 0
2 years ago
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If the value of y varies directly with x and y= -1 when x=3, find y if x=9
Zolol [24]

y = - 3

Since y varies directly as x then

y = kx ← ( k is the constant of variation )

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hence y = - \frac{1}{3} x

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y = - \frac{1}{3} × 9 = - 3


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Step-by-step explanation:

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