Ava45018
Ava45018
29-12-2017
Mathematics
contestada
How do u do this??????
Respuesta :
icedipping
icedipping
29-12-2017
f(x^2) = x^2 - 3
5f(x^2) = 5x^2 - 15 = 2x - 8
Placing all the terms on the left side, we get:
5x^2 - 2x - 7 = 0 which factorises to
(5x - 7)(x + 1) = 0
So, x = 7/5 or x = -1
But x is non-negative, so x = 7/5 = 1 2/5
C
is the answer.
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