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jasenka [17]
3 years ago
12

Explain and correct the error made by a student who simplified this expression -2+7(x+8)

Mathematics
2 answers:
kenny6666 [7]3 years ago
8 0

Answer:

7x + 54

Step-by-step explanation:

Given

- 2 + 7(x + 8)

The student made the error of adding before multiplying, that is

- 2 + 7 = 5 , then multiplying (x + 8) by 5

However, multiplication is performed before addition/ subtraction, thus

- 2 + 7(x + 8) ← distribute by 7

= - 2 + 7x + 56 ← collect like terms

= 7x + 54

nalin [4]3 years ago
4 0

Answer:

The error made by the student was that they didn't distribute the 7 first, they just added -2 and 7. The correct way would be to distribute first:

-2+7(x+8)

-2+7x+56

54+7x

*Hey! Hope this helped : )*

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If you know the definition of expand (to increase or make bigger)
then this will be easy.

when ever it asks for expanded for that means your answer has to be bigger than the number your given.

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Read 2 more answers
The polynomial x3 + 8 is equal to
kondor19780726 [428]

Step-by-step explanation:

The polynomial x³ + 8 is equal to (x + 2)(x² - 2x + 4)

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