5/8 divided 1/16=10
5/8 divided 1/32=20
WRITE THE PARTICULAR EQUATION EXPRESSING COST (C) IN TERMS OF MILES (D) TRAVELED.
PLEASE SHOW ALL WORK
A.
x ≥ –1
B.
x ≤ –1
C.
x ≤ –2
D.
x ≥ –2
by using the quadratic equation.
Answer:
Step-by-step explanation:
Here the coefficients of this quadratic equation are {7, -1, -3}. Note that the given equation must be rewritten in standard form: 7x^2 - x - 3.
Then the discriminant, b^2 - 4ac, is (-1)^2 - 4(7)(-3), or 1 + 84, or 85. Because this discriminant is positive, the given quadratic has two real, unequal roots. These roots are:
-(-1) ± √85
x = ------------------
14
or:
1 ± √85
x = ------------------
14