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What is the error in the student work below?
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1 vote
What is the error in the student work below?

What is the error in the student work below?-example-1
User Manu Evans
by
5.3k points

2 Answers

5 votes

Answer:

This is +16x not minus 16x as shown in the problem

Explanation:

4x^3 + 4x^2 -8x-(8x^2 -16x+4)

Distribute the minus sign

4x^3 + 4x^2 -8x-8x^2 +16x-4

The error is here This is +16x not minus 16x as shown in the problem

4x^3 -4x^2 +8x-4

User Matt Sach
by
5.3k points
1 vote

The negative 16 in the second line should be positive 16.

See attached picture:

What is the error in the student work below?-example-1
User Zerobasedindex
by
5.1k points
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