Answer:
Step-by-step explanation:
A quadratic equation can be factorised if and only if there are rational roots.
For any quadratic equation the discriminant decides about the nature of roots.
Thus only if the discriminant is a perfect square we can have rational roots and in this case only factorization is possible.
In the given equation

Since 1 is a perfect square we can factor and solve

Answer:
there is a total of 20 students in the class because 60% of 20 is 12
Step-by-step explanation:
pls answer my recent question :(
Answer:
EFD
Step-by-step explanation:
Just follow the marks on the triangle.
Diameter= 18cm
Radius is half of diameter
Radius=9cm