Question

If f(x) is a continuous function defined for all real numbers, f(-10)=-2, f(-8)=5, and f(x)=0 for one and only one value of x, then which of the following could be that x value? a.) -7 b.)-9 c.)0 or d.)2

Answer 1

which x-value is between -10 and -8?

Answer 2

did you try similarity of triangles?