9000020408

Which of the given equations have at least one root the same? $$\begin{array}{rlr}{x}^2+8x+15& =0& \text{(1)}\\ x^2-8x+15& =0& \text{(2)}\\ x^2+\phantom{8}x-12& =0& \text{(3)}\\ x^2-2x-\phantom{1}8& =0& \text{(4)}\end{array}$$