Answer:
Brady did not distribute the -1 correctly.
Step-by-step explanation:
The given expresion is
Recall that for all real numbers a, b, and c, the distributive property says that:
We apply this property to get:
But Brady said it is equivalent to 1.3-4.5
Hence Brady did not apply the distributive property correctly.
Answer:
125
Step-by-step explanation:
Add all the angles then subtract by 360.
Step-by-step explanation:
is the number of unit squares that cover surface of a figure.
Answer:
Step-by-step explanation:
Plot the vertices of the rectangle on a coordinate plane (Observe the figure attached where the rectangle is identified as ABCD).
The area of a rectangle can be calculated with this formula:
Where "l" is the lenght and "w" is the width.
In order to find the lenght and the width, you can use the formula for calculate the distance between two points:
Knowing the coordinates of the vertices, you get:
Therefore, substituting values into the formula , you get that the area of the rectangle is:
is the formula for calculating x1 and x2
To prove x1 + x2 = -b/a all we need to do is to express x1 and x2 from equation above
once we do we will get -2b/2a which is equal to -b/a because square root part will negate each other. one has + sign in front and other - sign
Showing that x1x2 = c/a goes similar way.
the numerator parts is actually difference of squares. after that we will have:
-b^2 -b^2 + 4ac = 4ac
in denominator we have 2a*2a = 4a^2
4ac/4aa = c/a