Answer:
-15x-4
Step-by-step explanation:
-21x + 6x-4
-15x-4
We can use quadratic formula to determine the roots of the given quadratic equation.
The quadratic formula is:

b = coefficient of x term = 4
a = coefficient of squared term = 1
c = constant term = 7
Using the values, we get:
So, the correct answer to this question is option A
The value of can never be 0
y = 0
A
0.4 is 4/10 in decimal form.
You would need to change the slope to -6 because perpendicular lines have opposite reciprocal slopes.