Marcus solved for x in the quadratic equation x2 – 10x + 25 = 0.

Option 1,3 and 4 are correct.

Step-by-step explanation:

Given is a quadratic equation

Marcus used quadratic formula to solve this

The correct use of formula is

for the quadratic equation

Comparing we have a =1, b =-10: c=25

The student should have substituted -10 for b but he wrong did only 10

II option is wrong since 2 is substituted correctly

III option is right -4ac i.e. the product x 4 must have been subtracted

IV option is right since repeated root is there so only one solution

a

step-by-step explanation: