Question

In don't understand how to work this problem out

Answer 1

`x^2+8x-11=\\ x^2+8x+16-27=\\ (x+4)^2-27=\\ (x+4-√(27))(x+4+\sqrt27)=\\ (x+4-3√(3))(x+4+3\sqrt3)`


`x^2+6x-11=\\ x^2+6x+9-20=\\ (x+3)^2-20=\\ (x+3-√(20))(x+3+√(20))=\\ (x+3-2\sqrt5)(x+3+2\sqrt5)`