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Arlecino [84]
1 year ago
15

Evaluate the expression 9 - z when z = 4.

Mathematics
2 answers:
Gnom [1K]1 year ago
7 0
We plug in 4 for the value z

9 - z = 9 - 4 = 5
madam [21]1 year ago
6 0

Answer:

its 5 5+4=9

Step-by-step explanation:

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The square of a negative number is twenty-eight more than three times the negative number. Find the number.
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The number is x

it is negative
the square is 28 more than 3 times itself
x²=28+3x
minus (28+3x)
x²-3x-28=0
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(x-7)(x+4)=0
set to zero

x-7=0
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this is not the answer because we were told the number was negative


x+4=0
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correct

the number is -4
test
(-4)²=28+3(-4)
16=28-12
16=16
check


the number is -4
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