Question

20z^2=40z+60 what are the solutions of the equation?

Answer 1

Solutions:
z = -1
z = 3

Answer 2

you really know ur math, thank you

Answer 3

@kianap really could use some clarification on other questions

Answer 4

glad to help...! : )

Answer 5

\[20z^2 - 40z - 60z = 0\]
\[20(z^2 - 2z - 3) = 0\]
\[z^2 -2z -3 = 0\]
\[(z-3)(z+1) =0\]
Then z = 3 and z = -1 should be your solutions.
you have two solutions because two values if plugged in for z would give 0, also look up factoring quadratic equations to see how I got to the last step.