(5x-7)2 + 140x
= 25x2 - 70x + 14 + 140x
= 25x2 + 70x + 14
= (5x+7)2
We have two same shapes of the kite. The top and bottom. Both are triangles so the formula is LxW divided by 2 equals Area. The length is 12 and width is 2. 12x2=24 then 24 divided by 2 equals 12. Since the bottom is the same, we do it again adding 12+12=24. The top is 6x2=12 but because when we cut it in half and then add again from the opposite side. It will be 12 in the end. After that we add 12+24 and the area will be 36ft2.
Consider this solution:
the only solution is (-1;-1), it is intersection point.
Triangle angles add to 180 degrees; geometry over.
x + 10 + x + 3x - 5 = 180
5x + 5 = 180
5x = 175
x = 35
Answer: 35