Question

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

Answer 1

Answer: y = 3 or y=7

Step-by-step 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