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Lucia finds that (3x²+3x+5)+(7x²-9x+8)=10x²-12x+13. What error did Lucia make?


A)She found the difference instead of the sum.

B)She combined the terms 3x² and 7x² incorrectly.

C)She combined the terms 3x and –9x incorrectly.

D)She did not combine all like terms.

Verified Answer :

callieanneparke

lucia combined like terms in correctly
your answer is c,
she should have gotten -6x
because -9+3=6

her answer should be 10^2 -6x+13

View image callieanneparke
calculista

Answer:

The answer is the option C

She combined the terms \(3x\) and \(-9x\) incorrectly

Step-by-step explanation:

we have

\((3x^{2} +3x+5)+(7x^{2}-9x+8)\)

Group terms that contain the same variable

\((3x^{2}+7x^{2})+(3x-9x)+(5+8)\)

Combine like terms

\((10x^{2})+(-6x)+(13)\)

Lucia combined the terms \(3x\) and \(-9x\) incorrectly

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