2 answers

If f(x)=x^3-3^2+5find f(0)+f(3)?

Question:

If f(x)=x^3-3^2+5find f(0)+f(3)?

Answers

#19#

Explanation:

#f(0)# is the value that #f(x)# would be if #x# were #0#, and #f(3)# is the value that #f(x)# would be if #x# were #3#.

if #x# were #0:#

#x^3 - 3^2 + 5 = 0^2 - 9 + 5#

#0^3 - 9 = 0 - 9 = -9#

#-9 + 5 - -4#

#f(0) = -4#

if #x# were #3:#

#x^3 - 3^2 + 5 = 3^3 - 9 + 5#

#3^3 - 9 = 27 - 9 = 18#

#18 + 5 = 23#

#f(3) = 23#

hence, the value of #f(0) + f(3)# is #-4 = 23#, or #23 - 4#

this is #19#.

.

#19#

Explanation:

#"substitute x = 0 and x = 3 into "f(x)#

#rArrf(0)=0^3-3^2+5=0-9+5=-4#

#rArrf(3)=3^3-3^2+5=27-9+5=23#

#rArrf(0)+f(3)=-4+23=19#

.

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