Use the quadratic formula to find the exact solutions of x2 − 9x + 5 = 0.

x equals negative b plus or minus the square root of b squared minus 4 times a times c, all over 2 times a

x equals negative 9 plus or minus the square root of 101, all over 2
x equals 9 plus or minus the square root of 101, all over 2
x equals negative 9 plus or minus the square root of 61, all over 2
x equals 9 plus or minus the square root of 61, all over 2

Step-by-step explanation:

All those words, when the math is so much clearer!

x = (9±√(9^2-4*1*5))/2 = (9±√101)/2

step-by-step explanation:

try remembering the steps

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional