Question

x²+10x+21

Answer 1

HI

Answer 2

ok, thanks for sharing that

Answer 3

(x+7)(x+3)

Answer 4

You can use the quadratic function
a is 1
b is 10
c is 21
\[x=\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }\]

Answer 5

LOL!

Answer 6

formula not function sorry