A rectangular circuit board is designed to have width w inches, perimeter p inches, and area x square inches. Which of the following equations must be true? Pick one.
A) w^2 + pw + x = 0
B) w^2 - pw + 2x = 0
C) 2w^2 + pw + 2x = 0
D) 2w^2 - pw - 2x = 0
E) 2w^2 - pw + 2x = 0
Notice that we can discard options A, and C right away. The sum of 3 positive values Cannot be 0.   Now, assume:   Width =w = 1 inchand length = 1 inch;   Perimeter =p = 4 inches;   Area =x = 1 square inches.   Plug the values of w, p, and x into the answer choices: only for E 2w^2 - pw  + 2= 
<gadget id="calculator"> + 2</gadget>
<output>2</output>
2 - 4 + 2= 
<gadget id="calculator">2 - 4 + 2</gadget>
<output>0</output>
0.   Answer: 2w^2 - pw + 2x= 0.
<result>E</result>
A rectangular circuit board is designed to have width w inches, perimeter p inches, and area x square inches. Which of the following equations must be true?