What equation is equivalent to (1/3)^x=27^x+2 ?

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The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b