Question

In the quadratic equation m2+4m-21=0 what are the values of the roots

Answer 1

Answer:

$\tt -7 \: or \: 3$

Step-by-step explanation:

We have,

$\tt m^2 +4m -21=0$

$\tt m^2 +7m-3m -21=0$

$\tt m(m+7)-3(m+7)=0$

$\tt (m+7)(m-3)=0$

$\tt m= -7 \: or \: 3$