Question

What are the zeros of x²+10x+21

Answer 1

Answer:

Step-by-step explanation:

X^2+10x+21

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

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

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

x= -7 x= -3

Answer 2

Answer:

${(x )}^{2} + 7x + 3x + 21 \\ x(x + 7) + 3(x + 7) \\ (x + 3)(x + 7) \\ x = - 3 \: or - 7$