If f : R R is defined by f(x) = x2
+ 2 then the pre image of 27 are
a. 0,5
b. 5, -5
c. 5, 0
d.
5 , - 5
Answers
Answer:
5,0
Explanation:
Answer: 5,-5
Explanation: Given : f : R R is defined by f(x) = x² + 2
To find : the pre image of 27 are
Solution : first we put the option 1
0,5 in the function
f(x) = x²+ 2
put x= 0
f(x) = 0 + 2
= 2
put x = 5
f(x) = (5)² + 2
= 27
so , this option does not satisfy the condition.
now we try option 2
(5,-5)
f(x) = x² + 2
put x= 5
f(x) = (5)² + 2
f(x) = 25 + 2
f(x) = 27
now put x= -5
f(x) = (-5)²+2
f(x) = 25+2
f(x) = 27
this option satisfy the condition this is the correct option.
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