Question

If f(x) = 2x^2+3 and (f(a+2)-f(2))/a = 18 then the value of a is

Answer 1

Answer:

Since f(x)=2x

2

Therefore,

3.8−4

f(3.8)−f(4)

=

3.8−4

2(3.8)

2

−2(4)

2

=

4−3.8

2(4

2

−3.8

2

)

=

4−3.8

2(4+3.8)(4−3.8)

=2(4+3.8)=2×7.8=15.6