Question

Please show work; i will give brainliest for quickest and corect answer

Answer 1

Answer:

x=2

Step-by-step explanation:

Answer 2

x^2 + 4x - 16 = 0

I'm using the quadratic formula to solve this equation.

A = 1

B = 4

C = -16

x = -b +- $\sqrt{b^2 - 4ac}$  

over 2a

Plug it in:

x= -4 +- $\sqrt{4^2 -4(-16)}$ over 2

x= -4 +- $\sqrt{16+64$ over 2

x = -4 +-$\sqrt{80}$ over 2

x = -4 +- 4$\sqrt{5$

Divide by 2.

x = -2 +- 2$\sqrt{5$

Therefore, x would be -2 + 2$\sqrt{5}$, -2 - 2$\sqrt{5}$

Convert to decimal form: 2.47213595, -6.47213595

Round it: 2.4714595 = 2.5 and -6.47213595 = -6.5