Question

Solve the quadratic equation
y^2 −10y+21=0
y=?

Answer 1

Answer: y = 3 or y=7

Explanation:

`y^(2) -10y+21`

what 2 factors of 21 can equal 10 when added together (1*21- no 3*7- yes)

Factor

`(y-3)(y-7)`

y-3=0

y=3

or y-7=0

y=7