Quadratic equations

Solve for x: $x^{2}-11x+30=0$

Solve for x: $x^{2}+13x+40=0$

Solve for x: $x^{2}-x=0$

Solve for x: $x^{2}+6x+8=0$

Solve for x: $x^{2}-7x+12=0$

Solve for x: $x^{2}+3x=0$

Solve for x: $x^{2}-5x+6=0$

Solve for x: $x^{2}+9x+8=0$

Solve for x: $x^{2}-6x-7=0$

Solve for x: $x^{2}-49=0$

Solve for x: $x^{2}-8x=0$

Solve for x: $x^{2}+7x=0$