Using trial and error
x^4+5x^2-36 factors to (x-2)(x+2)(x^2+9)
2x^2+9x-5 factors to (x+5)(2x-1)
so
(x-2)(x+2)(x^2+9)(x+5)(2x-1)=0
set each to zero
x-2=0
x=2
x+2=0
x=-2
x^2+9=0
x^2=-9
x=3√-1
x=3i
x+5=0
x=-5
2x-1=0
2x=1
x=1/2=0.5
roots are
x=-5-2,0.5,2, and the imaginary root 3i
Answer
28 minutes or 7/15 of an hour
Step-by-step explanation:
We know that Rate*Time = Distance. Because we are given distance and rate, we can easily change the equation to Distance/Rate = Time.
7/8 / 1 7/8 =
7/8 / 15/8 =
7/8 * 8/15 =
7/15 hour
7/15 * 60 = 28 minutes
(5-4)-3 = -2. If we move the parenthesis, as is defined by what the associative property is, 5-(4-3) = 4. No matter what, you always approach mathematical equations or expressions using PEMDA. We have to do what's inside the parenthesis first, which is why we end up with 2 different solutions using subtraction.
Answer: 2.27272727------- you can round or whatever -.-
Step-by-step explanation: