Solve the quadratic equation by using either a numeric or a graphic approach.
x^2-11x-121= 0

x= 11/2 + 11/2√5 or x= 11/2 + −11/2√5

Step-by-step explanation:

For this equation: a=1, b=-11, c=-121

1x^2−11x−121=0

Step 1: Use quadratic formula with a=1, b= -11, c= -121.

x= (−b±√b^2−4ac)/2a

x= (−(−11)±√(−11)2−4(1)(−121))/2(1)

x= (11±√605)/2

x=11/2 + 11/2√5 or x=11/2 −11/2√5

I recommend using a site called MathPapa for problems like this.

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