Algebra Demystified 2nd Ed

Chapter 10 QuadratiC EQuations 383

Quiz

1. If ( xx–  89 )(  )+  =  0 , then

a. x=89,

b. x=− −89,

C. x=−89,

d. x=−89,

2. To apply the quadratic formula 34 xx^2 +  =  8 ,

a. ab== 34 ,,c= 8

b. ab==−= 34 ,,c 8

C. ab== 34 ,,c=− 8

d. ab==−=− 34 ,,c 8

3. Simplify^640
   4

 ± (^).
a.^310
2
±
b.^340
2
±
C. 31 ± 0
d. −± 310

4. If xx^2 –  –    90 =  , then

a. x=−±^137

2

b. x=^13 ±^7

2

C. x=−±^135

2

d. x=^13 ±^5

2