Find all values of x (if any) where the tangent line to the graph of the given equation is horizontal. HINT [The tangent line is horizontal when its slope is zero.] (If an answer does not exist, enter DNE. Enter your answers as a comma-separated list.)
y = −7x^2 − 4x

Question

Find all values of x (if any) where the tangent line to the graph of the given equation is horizontal. HINT [The tangent line is horizontal when its slope is zero.] (If an answer does not exist, enter DNE. Enter your answers as a comma-separated list.)
y = −7x^2 − 4x

kmeis002 · Answer

If its slope is zero, its refering to the derivative, so take its derivative and set it equal to zero, so for x and bingo.