#### Answer

B. -1.57, 1.27

#### Work Step by Step

By entering the given equation (only the part left to the equal sign) into $Y_{1}$ on a graphing calculator, we can determine its zeros. After pressing the "graph" button, press the "2nd" button followed by the "trace" button. Go down to "zero" and press "enter". To find the first zero, bring the cursor on the graph just left to where it looks like the equation hits the x-axis and press "enter". Then, bring the cursor just right to where it looks like the equation hits the x-axis and press "enter". Repeat for the other zero.