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(-------) + Vz^2 = 10^2

^ Vz+√Vz^2-8*9.8

Vz^ / It is a 2d motion problem.

| / Find Vz, then Vx (which is the left term, the fraction one)

| / 10m/s to find angle at which projectile was shot.

| / To do check, I basically did the above equation into

| / Vz=10^2-Vx^2, but no matter what I do, my results

|)__________>Vx of Vz always ends up in the end making Vz^2+Vx^2

not equal 10, and always greater than 10 in my three days attempt at this, and in the end, it turns into a jumble of mess, as I have also turned up with imaginary numbers in the middle of the steps. So, the problem is, how to solve the above equation so that I can find angle by tangenting Vz/Vx, and is it supposed to come out with imaginary number? I am only slightly familiar with complex numbers, so I can't progress further,