Best Online CAT Coaching

Given that

Also ac > 0. It means,
(i) either both a and c are positive values, or
(ii) both a ad c are negative values.
Let’s take case-(i), a and c are +ve values.
From equation (3), we can say c is + 4x then b = − 3x
Consequently, from equation (1), a = + x (a & c should be of the same sign) 

Let’s take case-(ii), a and c are -ve values
From equation (3), we can say c is − 4x then b = +3
Consequently, from equation (1), a = − x (a & c should be of the same sign)

In either of the cases considered above, the value of the expression is equal to 1.