10. Quadratic Equations

Find the solution(s) using the quadratic formula.

$x^2+6x-7=0$

Find the solution(s) using the quadratic formula.

$\frac{3}{2}{z}^2-\frac{5}{4}z-1=0$

Find the solution(s) using the quadratic formula.

$4x^2-4x+1=0$

Determine the number and type of solutions of the given quadratic equation. Do not solve. 

$x^2+8x+16=0$