Solve the equation for all values of x by completing the square.
3x^2-60x+255=0

x=5 and x=15

Step-by-step explanation:

3x^2-60x+225=0

3x^2-60x+225/3=0/3

x^2-20x+75=0

x^2-5x-15x+75=0

x(x-5)-15(x-5)=0

(x-5)(x-15)=0

x-5=0 x-15=0

x=5 x=15

only 10/60 isn't equivalent

hope this : )

the answer would be c:   ax + b = ax + c

step-by-step explanation: