Question

X²+4x+21 factorise the following​

Answer 1

Answer:

x=-7

Step-by-step explanation:

X²+4x+21 factorise the following

Answer 2

Answer:

$2 +-\sqrt{17}$

Step-by-step explanation:

$\frac{-4 +-\sqrt{16 - 4(1)(21)} }{2(1)} \\\ \frac{-4+-\sqrt{-68} }{2} \\\ \frac{-4 +- 2\sqrt{17} }{2} \\\\-2 +-\sqrt{17}$