For what value of x is this expression undefined?

Question

(X+1)/(3x²+2x-5)

Answer 1

Division by zero is undefined, so any value of x that makes the denominator equal zero will make the expression undefined. To find those values of x, set the denominator equal to zero then solve for x:

3x² + 2x - 5 = 0

Solve by factoring (use the ac method) or by using the quadratic formula. You'll get two answers.