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Alex17521 [72]
3 years ago
7

Francesca tried to evaluate an expression. Here is her work: 3(5)2–18÷3 = 3(25)–18÷3 = 75–18÷3 = 57÷3 = 19 Is Francesca's work c

orrect?
Mathematics
1 answer:
hram777 [196]3 years ago
5 0

Answer:

Nope. Moltiplication (and thus divisions) has to be done before any addition or subtractions, unless parenthesis indicate otherwise.

3(5)^2 - 18\div 3 = 3(25) - 6 = 75-6=69

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3 years ago
Which are the solutions of x2 = -5x + 8?
Oksana_A [137]

Answer:

1.27, -6.27 to the nearest hundredth,

or if you require it in exact form,

-2.5 + √14.25,   -2.5 - √14.25.

Step-by-step explanation:

x^2 = -5x + 8

x^2 + 5x  = 8

Competing the square:

(x + 2.5)^2 - 6.25 = 8

(x + 2.5) = 14.25

x + 2.5 = +/-√14.25

x = -2.5 + √14.25,   -2.5 - √14.25

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6 0
3 years ago
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pochemuha

Answer:

x= -18

Step-by-step explanation:

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-7 = -1 + x/3

-6 = x/3

x= 3*-6

x= -18

6 0
3 years ago
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Sunny_sXe [5.5K]

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No

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3 years ago
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