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MrRa [10]
3 years ago
14

Saved

Mathematics
1 answer:
Scorpion4ik [409]3 years ago
7 0
Answer: 91/167

Explanation:
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Percy solved the equation x2 + 7x + 12 = 12. His work is shown below. Is Percy correct? Explain.
antoniya [11.8K]
= > x² + 7x + 12 = 12

= > x² + ( 4 + 3 )x + 12 = 12

= > x² + 4x + 3x + 12 = 12

= > x( x + 4 ) + 3( x + 4 ) = 12

= > ( x + 4 ) ( x + 3 ) = 12


Percy did correct till this step. But by doing like this, Percy can't get the values of the variable x.



Percy should follow the following steps :

= > x² + 7x + 12 = 12


Add -12 on both sides,


= > x² + 7x + 12 - 12 = 12 - 12

= > x² + 7x = 0

= > x( x + 7 ) = 0

= > ( x = 0 ) or ( x + 7 = 0 )

= > ( x = 0 ) or ( x = - 7 )



Hence, required value(s) of x is 0 or -7
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3 years ago
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Jim bought 3 cds at a cost of $14.99 each what will he pay including 6% sales tax
Charra [1.4K]

14.99 *3 = 44.97

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3 years ago
Does anyone know this?
monitta
The answer should be 101.
8 0
3 years ago
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ANSWER FAST
brilliants [131]

Answer:

y = 1

Step-by-step explanation:

x + y = 16

x - y = 14     add the equations

--------------

2x = 30

x = 15

x + y = 16

15 + y = 16

y = 1

the numbers are 15 and 1

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6a    perimeter  is 12 cms  and 28cms.

6b side length is 90 cms

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6d 11 cms
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3 years ago
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