Answer:
7x²-3x
Step-by-step explanation:
What is the are of the shaded region. The inner square is a width of x and a length of x+7. The outer square is a length of 4x and a width of 2x + 1.
Area of a square = Length * Length
Area of the inner square = x (x+7)
Area of the inner square = x²+7x
Area of the outer square = 4x(2x+1)
Area of the outer square = 8x²+4x
Area of the shaded region = Area of outer square - Area of inner square
Area of the shaded region = (8x²+4x)-(x²+7x)
Area of the shaded region = 8x²+4x-x²-7x
Area of the shaded region = 7x²-3x
This gives the area of the shaded region
Answer:
B
Step-by-step explanation:
Given focus as (h,k) and directrix as y = mx + b, the equation of a parabola is given as:
Hence, from the given focus & directrix, we have:
h = -1
k = -1
m = 0
b = 1
<em>We can plug them into the formula and arrange to get:</em>
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<em>B is the correct answer.</em>
Answer is the first one, A. 8 1/4
Distribute on the left
-3k+12=48
Then subtract 12 from both sides
-3k=36
Divide both sides by -3
k=-12
Final answer: k=-12
It’s a Yes, then No, then No