\(x^2+3x-10=0\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x^2-2x+5x-10=0\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x.\left(x-2\right)+5\left(x-2\right)=0\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \left(x+5\right).\left(x-2\right)=0\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x+5=0vàx-2=0\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ x=-5vàx=2\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ vậyx=\left(2,-5\right)\)