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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.

Respuesta :

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
Ver imagen callieanneparke
calculista

Answer:

The answer is the option C

She combined the terms [tex]3x[/tex] and [tex]-9x[/tex] incorrectly

Step-by-step explanation:

we have

[tex](3x^{2} +3x+5)+(7x^{2}-9x+8)[/tex]

Group terms that contain the same variable

[tex](3x^{2}+7x^{2})+(3x-9x)+(5+8)[/tex]

Combine like terms

[tex](10x^{2})+(-6x)+(13)[/tex]

Lucia combined the terms [tex]3x[/tex] and [tex]-9x[/tex] incorrectly

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