Maths unit A:Function notation and solving functions

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  • Created by: rvsn
  • Created on: 17-11-14 21:10
What does f(x) mean?
f- the function takes an input (x) and makes an output
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if f(x)=2x^2-1, find f(2)
f(2)=2(2)^2-1, =2x4-1, =8-1, =7
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if f(x)=2x^2-1, find f(2x+1)
f(2x+1)=2(2x+1)^2-1, =2(4x^2+4x+1)-1, =8x^2+8x+2-1, =8x^2+8x+1
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What does it mean by 'solve' a function?
we need to find the input(x) which gives you a certain output
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If f(x)=2x+3, solve f(x)=10
2x+3=10, 2x=10-3, 2x=7, x=7/2, x=3.5
5 of 5

Other cards in this set

Card 2

Front

if f(x)=2x^2-1, find f(2)

Back

f(2)=2(2)^2-1, =2x4-1, =8-1, =7

Card 3

Front

if f(x)=2x^2-1, find f(2x+1)

Back

Preview of the front of card 3

Card 4

Front

What does it mean by 'solve' a function?

Back

Preview of the front of card 4

Card 5

Front

If f(x)=2x+3, solve f(x)=10

Back

Preview of the front of card 5

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