3x²+x-5=0
a = 3, b = 1, c= -5
-> ∆ ( delta ) = b²-4ac = 61 > 0
-> x1 =( -b+√∆ )÷ 2a =...
x2 = (-b-√∆)÷2a =...
p/s: do your teachers teach you how to use ∆ ( delta ) in maths calculation ? i live in europe and our teachers teach us that way. however, it is a rịght and fast way. you should learn it.
Answer:
C) 384
Step-by-step explanation:
A=bh
The diameter of the pool cover in one hundred feet
Divide both sides by -3, and replace with . Then
Factorize the quadratic in to get
which in turn means
But for all real , so we can ignore the first solution. This leaves us with
If we allow for any complex solution, then we can continue with the solution we ignored: