No
Explanation
Do it on your own
I think its he didnt eliminate the same variables
Step-by-step explanation:
For the quadratic equation to have 1 repeated real solution, the discriminant b² - 4ac must be zero.
=> (-z)² - 4(z - 5)(5) = 0
=> z² - 20(z - 5) = 0
=> z² - 20z + 100 = 0
=> (z - 10)² = 0
Therefore z = 10.
X = - 1/2
In other way is x = -0.2 , x = -5^-1
