Add or subtract

Question

(4x^2+15x-3)-(3x^2+5)
A. 7x^2+15x-8
B. x^2+12x+2
C. x^2+15x-8
D. 7x^2+8

Please help me. Thanks

Answer 1

Do you know what like terms are?

Answer 2

No I don't know nothing about this stuff.

Answer 3

Like terms are terms that have the same degree (power)

so x^2 have the same degree. Combine the two by subtracting 4 and 3

The x's are a like term. Check if there are any like terms in the second equation

Same as above for the constants(-3 and 5)

(I would link to a better tutorial but I am not allowed to. Just look up adding and subtracting like terms on google )

(Hope I helped!)

Answer 4

The 4x^2 and 3x^2 are like terms. You can add or subtract like terms but not unlike terms. The 15x is a different terms than x^2 and has no other like term.
So 4x^2 - 3x^2 = x^2
+15x has nothing to add or subtract so it remains 15x.
-3 and -5 = -8

Answer 5

So then the answer is A??

Answer 6

No. DrBob just said in his post above that 4x^2 - 3x^2 = x^2

Answer 7

These are the screennames of our trusted math & science tutors: bobpursley, DrBob222, Reiny, MathMate, Steve, Ms. Sue, Damon, PsyDAG.

Any others who reply to your posts are other students ... and many are just guessing. Don't believe the guessers!

In addition, if you truly mean this -- "I don't know nothing about this stuff" -- you need to take a different class to prepare for this one. Why are you in this class if you aren't prepared?