Unit 3 Assessment

Solve:  $x^2+6x-27=0$  

• -3, 6

• -9, 3

• -3, 27

• -3, 9

Solve:  $2x^2+x-28=0$  

•  $-4,\ \frac{2}{7}$  

•  $-4,\ \frac{7}{2}$  

• -4, 7

•  $4,\ -\frac{7}{2}$  

Solve: $2m^2-m+9=0$  

•  $\frac{1\pm\sqrt{73}}{4}$  

•  $\frac{1}{4}\pm\frac{\sqrt{35}}{4}i$  

•  $\frac{1}{4}\pm\frac{\sqrt{71}}{4}i$  

•  $\frac{1\pm\sqrt{71}}{4}$  

Solve: $x+3\sqrt{x}-18=0$  

• 3

• 81

•  $\pm\sqrt{3}$  

• 9

 $y^2+1=0$  

•  $-i,i$  

•  $-i,1$  

•  $i$  

•  $-i$  

Solve:  $\frac{12}{3x-2}-\frac{5}{x+4}=1$  

•  $\frac{22}{3},\ -3$  

•  $\frac{58}{3}$  

•  $-\frac{22}{3},\ 3$  

•  $-\frac{3}{22},\ 3$  

Solve:  $\sqrt{5x+14}+3=5$  

• 10

• -2

•  $\frac{144}{25}$  

•  $\frac{18}{5}$  

Solve:  $\left|5x+4\right|=9$  

• 1

•  $-\frac{5}{13},\ 1$  

• -3, 1

•  $-\frac{13}{5},\ 1$  

Solve:  $\left|15+x\right|>2$  

•  $\left(-\infty,\ -17\right]\cup\left[13,\infty\right)$  

•  $\left(-17,\ 13\right)$  

•  $\left(-\infty,13\right)\cup\left(17,\infty\right)$  

•  $\left(-\infty,-17\right)\cup\left(-13,\infty\right)$  

The Shanghai World Financial Center is 1614 ft tall, s, starting height. (Source: infoplease.com). How long would it take t, seconds, an object falling freely from the top to reach the ground? (Use the formula  $s=16t^2$  ).

• About 10.0 sec

• About 50.4 sec

• About 2.5 sec

• About 100.9 sec