Question

if x^2-10x+21=(x+m)(x+n) , then m+n=​

Answer 1

Step-by-step explanation:

x²-10x+21

x²-7x-3x+21

x(x-7)-3(x-7)

(x-3)(x-7)

(x-3)(x-7)=(x+m)(x+n)

m=-3 and n=-7

m+n=-7-3= -10

Answer 2

Answer:

it helped in my test.. thank you

Step-by-step explanation:

if you will not give thanks.. then I don't bother about it :)