Given the functions j(x) = 3x2 - 2x + 5 and k(x) = 3x2 + 4, which operation results in a 1st degree polynomial?

Addition

Subtraction

Multiplication

No operations

Question

Given the functions j(x) = 3x2 - 2x + 5 and k(x) = 3x2 + 4, which operation results in a 1st degree polynomial?

 Addition

 Subtraction

 Multiplication

 No operations

anonymous · Answer

@amistre64

amistre64 · Answer

any ideas?

anonymous · Answer

no

amistre64 · Answer

well, when we have no ideas, then the best thing to do is trial and error

amistre64 · Answer

what happens when we add them?  does the x^2 parts go to 0?

what happens when we subtract  them?  does the x^2 parts go to 0?

etc ....

anonymous · Answer

just so i understand this. What is a 1st degree polynomial

amistre64 · Answer

the highest degree of x is 1.  so its asking for a form of  ax + b

anonymous · Answer

ok

anonymous · Answer

j(x) = 3x^2 -2x+5
                   +2x
        =3x^2+5
                  -5
j(x) =3x^2

amistre64 · Answer

since we have a 3x2 and a 3x2 in both of them,  adding doesnt work for me,  but subtracting rids us of those terms rather nicely:  why?

(3x^2 -2x+5) - (3x2+4)