1. 4xsq + 3x -8=0

2. 9xsq + 30x – 29 =0

how did you do these?

what is the square root of 145?

February 5th, 2011 @8:49 am

Question 1

4x² + 3x – 8 = 0

x = [ - 3 ± ? (9 + 128 ) ] / 8

x = [ - 3 ± ? (137) ] / 8

x = -1.84 , x = 1.09

Question 2

9x² + 30x – 29 = 0

x = [ - 30 ± ? (900 + 1044 ) ] / 18

x = [ - 30 ± 44.1 ] / 18

x = 0.783 , x = – 4.12

Question 3

?145 = 12.04

The solution to anything of the form ax²+bx+c=0 is

-b±?(b²-4ac)

—————–

2a

So, in the first problem, a=4, b=3, and c=-8