Using the formula, find the value of x in x2+7x+12=0.
The formula to find the value of x in quadratic equation (ax2+bx+c) is given by
x=−b±√b2−4ac2a
Using the same formula we find the value of x in x2+7x+12.
Here, a=1,b=7,c=12
∴ x=−7±√72−4×1×122×1
⟹ x=−7±√49−482
⟹ x=−7±12
∴ x=−7+12=−3 or x=−7−12=−4
∴ x=−3 or x=−4