Given that Find the values of for which is increasing

MATHEMATICS · Subjective · AP · Calculus AB · Analytical Applications of Differentiation · Analytical Applications of Differentiation

Problem

Given that

y = x^4 + 8x^3 - 12x^2 + 6x - 10

Find the values of

x

for which

\frac{d^2y}{dx^2}

is increasing. Give your answer in inequality notation.