Question

find the values of x for wich the functions
$f(x) = 3 {x}^{2} - 1 \: and \: g(x) = 3 + x \: \: are \: equal$
1. -4/3 , 1
2. -4 , -3
3. 4/3 , -1
4. 4 , 3
( Please give the answer with explanation )​

Answer 1

3x^2-1=3+x

3x^2-x-4=0
3x^2-4x+3x-4=0
X(3x-4)+1(3x-4)=0
X=-1,4/3