Help me with this please​

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

How is working backward similar to solving an equation?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)