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# Need help!!!

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Hello, I need help with these three problems I'm not good with this so I'd appreciate help :)

1st question:

2nd Question:

3rd question (this looks sooo difficult!):

Mar 12, 2019
edited by Guest  Mar 12, 2019

#1
+111437
+1

Only the last one is actually tough....the notation may be giving you trouble......

First one

(f + g)(x)   means  f(x) + g(x)  =  [ 5x^2 - 2x ] + [ 3x^2 + x - 4 ]  =   8x^2 - x - 4

Second

(f * g) (x)   means   f(x) * g(x)  =

[ 3x^2 + 5 ] * [  x - 2 ]  =

3x^3 - 6x^2 + 5x - 10

Last one

(f / g)(x)    =   f(x) / g(x)

[ hint : factor the denominator first....see if you can use one of these factors in the numerator  !!!]

4x^2 + 19x - 5                (4x - 1)(x + 5)              x + 5

____________   =         ____________  =      ______

4x^2 - x                              x(4x - 1)                    x

Note that  either  x = 0  or  x = 1/4    makes the second denominator 0....so...we can't have these values of x

Mar 12, 2019
#2
+1

Thank you!

Guest Mar 12, 2019