SOLUTION: Let f(x)=2x^2-5x and find: A: f(-2) B: f(0) C: 2f(x) D: f(2x)

Question 88483This question is from textbook College Algebra
: Let f(x)=2x^2-5x and find:
A: f(-2)
B: f(0)
C: 2f(x)
D: f(2x) This question is from textbook College Algebra

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
A)
Start with the given polynomial

Plug in

Raise -2 to the second power to get 4

Multiply 2 by 4 to get 8

Multiply 5 by -2 to get -10

Now combine like terms

B)

Start with the given polynomial

Plug in

Raise 0 to the second power to get 0

Multiply 2 by 0 to get 0

Multiply 5 by 0 to get 0

Now combine like terms

C)
Start with the given polynomial

Multiply the entire polynomial by 2

Distribute

Multiply

D)
Start with the given polynomial

Plug in

Square

Multiply 2 and

Multiply 5 and 2x
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