Question

solve the quadratic equation by factorization mathod :x2+10x+21=0​

Answer 1

the value of x is -3 and -7

Answer 2

Answer:

x^2+10x+21=0

x^2+(7+3)x+21=0

x^2+7x+3x+21=0

x(x+7)+3(x+7)=0

(x+7) (x+3)=0

either, or,

x+7=0. x+3=0

x=-7 x=-3