Question Factor the expression 21(160−180∘c) Evaluate 80−90∘cSolution 21(160−180∘c) Show Solution Find the roots c=π160Alternative Form c≈2918.050089∘Alternative Form c≈50.929582 Evaluate 80−90∘cTo find the roots of the expression,set the expression equal to 0 80−90∘c=0Move the constant to the right-hand side and change its sign −90∘c=0−80Removing 0 doesn't change the value,so remove it from the expression −90∘c=−80Change the signs on both sides of the equation 90∘c=80Divide both sides 90∘90∘c=90∘80Divide the numbers c=90∘80Solution More Steps Evaluate 90∘80Rewrite the angle More Steps Evaluate 90∘Convert into radian measure,multiply by 180∘π 90∘×180∘πCalculate 2π 2π80Rewrite the expression 80×π2Multiply the numbers π80×2Multiply the numbers π160 c=π160Alternative Form c≈2918.050089∘Alternative Form c≈50.929582 Show Solution