Question

f(x)= 3x² - 1; x= -1/√3 , 2/√3​

Answer 1

Step-by-step explanation:

f(x)= 3x² - 1

$i)x = \frac{ - 1}{ \sqrt{3} } \\ = 3( { \frac{ - 1}{ \sqrt{3} } })^{2} - 1 \\ = 3( \frac{ 1}{3} ) - 1 \\ = 1 - 1 \\ 0$

$ii)x = \frac{2}{ \sqrt{3} } \\ = {3} ({ \frac{2}{ \sqrt{3} }) }^{2} - 1 \\ = 3( \frac{4}{3} ) - 1 \\ = 4 - 1 \\ = 3$