$x^2=16-4x\ \ \ |+4x\\\\x^2+4x=16\ \ \ \ |+2^2\\\\\underbrace{x^2+2\cdot x\cdot2+2^2}_{(a+b)^2=a^2+2ab+b^2}=16+2^2\\\\(x+2)^2=20\iff x+2=\pm\sqrt{20}\\\\x+2=-\sqrt{4\cdot5}\ \vee\ x+2=\sqrt{4\cdot5}\ \ \ |-2\\\\x=-2-2\sqrt5\ \vee\ x=-2+2\sqrt5$

Answer: D.

3 0

2 years ago

A rectangle has a width that is 3 inches more than the length. What is the area of the rectangle

Otrada [13]

Answer:

There can be multiple areas, but it can be 18. 3 times 6 is 18.

7 0

2 years ago

Which of the following are composite numbers check all that are true

-BARSIC- [3]

Answer:

33, 49, and 21.

Step-by-step explanation:

its 33, 49, and 21

hope this helps

4 0

2 years ago

7s paisa 2002

andreyandreev [35.5K]

Answer:

gdhrjrkfkrkkrkffiktkg

4 0

3 years ago