ANSWER
A. 73
EXPLANATION
The given expression is
![(2{x})^{2} - 3{y}^{2}](https://tex.z-dn.net/?f=%282%7Bx%7D%29%5E%7B2%7D%20%20-%203%7By%7D%5E%7B2%7D%20)
We substitute x=5 and y=3 to obtain:
![(2 \times 5)^{2} - 3{(3)}^{2} = {10}^{2} - 3 \times 9](https://tex.z-dn.net/?f=%282%20%5Ctimes%205%29%5E%7B2%7D%20%20-%203%7B%283%29%7D%5E%7B2%7D%20%20%3D%20%20%7B10%7D%5E%7B2%7D%20%20-%203%20%5Ctimes%209)
This simplifies to,
![= 100 - 27](https://tex.z-dn.net/?f=%20%3D%20100%20-%2027)
![= 73](https://tex.z-dn.net/?f=%20%3D%2073)
The correct choice is A.
Answer:
if im understanding right the answer should be x = -1
Step-by-step explanation:
5x - 11 = 3x - 9
subtract 3x
2x -11 = -9
add 11
2x = -2
divide by 2
x = -1
Answer:
A = 176.7 units²
Step-by-step explanation:
Put the hint to use. Do these side lengths reflect the Pythagorean Theorem?
9^2 + 12^2 = 15^2?
81 + 144 = 225? YES
Therefore, this is a right triangle, and the diameter is 15 units.
Thus, the radius is 15/2 units, and the area is A = πr², or
A = π(15/2 units)² = (225/4)π units². Using 3.14 for π, we get:
A = 176.7 units²