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borishaifa [10]
3 years ago
7

If f(x) = x2 − 1, and f(2a) = 35, then what could be the value of a ?

Mathematics
2 answers:
zepelin [54]3 years ago
7 0
F(2a)=35
f(2a)=(2a)^2-1=35
(2a)^2-1=35
add 1 both sides
(2a)^2=36
sqrt both sides
2a=+/-6
divde 2
a=+/-3

a=3 or -3
nlexa [21]3 years ago
5 0

When    f(x)=x^2-1
and       f(2a)=35    it means that:    x=2a
                                                     {   x^2-1=35

so: (2a)^2-1=35
      4(a^2)-1=35
      4(a^2)=35+1
      4(a^2)=36    /4
       a^2=9      
       a=3
      
      
     

                            

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