Answer:
a = 1, b = -7, c = 10
Explanation:
Az² + Bz + C is the general form of a quadratic 
Where,
A is the coefficient of z²
B is the coefficient of z
C is the constant 
z² -7z + 10=0 
a = 1, b = -7, c = 10
In case you need the factorized form too: 
z² - 7z + 10 = 0
z² - 5z - 2z + 10 = 0
z(z - 5) -2(z - 5) = 0
(z - 2)(z - 5) = 0