How would you figure this question out?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.