To search out perform values is the method of evaluating the perform for given values of x. The determine under exhibits how you can consider f(x) = 6x – 5 when x  = 2.

## Extra examples exhibiting how you can discover perform values

Instance #1

If f(x) = x2 + 4x + 3, discover perform values f(0), f(-2), and f(3).

f(0) = 02 + 4(0) + 3

= 0 + 0 + 3

= 3

f(-2) = (-2)2 + 4(-2) + 3

= 4 + -8 + 3

= -4 + 3

= -1

f(3) = (3)2 + 4(3) + 3

= 9 + 12 + 3

= 21 + 3

= 4

Instance #2

If g(x) = x2 + 5x – 12, discover perform values g(0), g(2x), and g(-2x).

g(0) = 02 + 5(0) – 12

= 0 + 0 -12

= -12

g(2x) = (2x)2 + 5(2x) – 12

= 4×2 + 10x – 12

g(-2x) = (-2x)2 + 5(-2x) – 12

= 4×2 + -10x – 12

Instance #3

If h(x) = 2×2 – 4x + 3, discover perform values h(0), h(-3x), and g(2x+1).

h(0) = 02 – 4(0) + 3

= 0 – 0 + 3

= 0 – 0 + 3

= 3

h(-3x) = (-3x)2 – 4(-3x) + 3

= 9×2 + 12x + 3

= 18x2 + 12x + 3

h(2x + 1) =  (2x+1)2 – 4(2x+1) + 3

=  (4×2 + 4x +1) – 8x – 4 + 3

=  8x2 + 8x + 2 – 8x – 4 + 3

= 8x2 + 1

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