OMG can someone please help me solve this problem

Select the approximate values of x that are solutions to f(x) = 0, where
f(x) = -7x2 + 2x + 6.

A.){–0.79, 1.08}

B.){-7, 2}

C.) {–0.29, –0.86}

D.) {–1.17, 0.33}