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avatar+673 

|2x + 4| = 14

 

What is the product of the solutions to the equation?

 

A) -81

B) -45

C) 0

D) 45

E) 81

 

 

 

 

 

If f(x) = 2x^2 and g(x)= x^2 + 2x, which expression represents g(f(x))?

 

A) 2x^4 + 4x^2

B) 4x^4 + 4x^2

C) 2x^4 + 8x^2

D) x^4 + 4x^3 + 4x^2

E) 2x^4 + 8x^3 + 8x^2

 

 

 

 

Find f(3). 

 

f(x) = x^2 + 5x - 9

 

A) 7

B) 10

C) 9

D) 12

E) 15

 

 

 

 

If h(x) = 2x^4 - 4x^2 - 2x, then h(3)= ?

 

A) -6

B) 120

C) 192

D) 1146

E) 1434

 Aug 28, 2019
 #1
avatar+103148 
+2

l 2x + 4  l  = 14       we have two equations to solve

 

2x + 4  = 14              2x + 4  = -14

2x  =10                      2x  = -18

x  = 5                           x = -9

 

So  the product of the solutions  =  5 * -9   =   -45

 

If f(x) = 2x^2 and g(x)= x^2 + 2x, which expression represents g(f(x))?

 

g (f(x))  means that we are putting  f  into g...so we have

 

(2x^2)^2 + 2(2x^2)  =

 

4x^4  + 4x^2

 

For  the last two, sub 3  into both functions and then evaluate each one

 

 

 

cool cool cool

 Aug 28, 2019

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