Answer:
50-35 bro easy , 21
Step-by-step explanation:
In a decagonal prism no. of
Edges=30
Faces=12
Vertices=20
X^2 - 5x - 7 = 0
x = (-b (+-) b^2 - 4ac) / 2a
a = 1, b = -5, c = -7
x = (-(-5) (+-) sqrt (-5^2) -4(1)(-7)) / 2(1)
x = (5 (+-) sqrt 25 + 28) / 2
x = (5 (+-) sqrt 53) / 2
To simplify this fraction, multiply the entire fraction by the conjugate of the denominator. The conjugate of a square root and a number being added to it would be the number <em>subtracted </em>from the square root. In other words, the conjugate of 
would be
.
Applying that information to our fraction shown here, the conjugate of the denominator would be 
. We will multiply both the numerator and denominator of our original fraction by this expression to obtain our answer, as shown below.
Our answer is 
.
Parentheses
Exponent
Multiplication
Division
Addition
Subtraction
so therefore, the last one of these in the equation (subtraction) is the last operation
