Solve the quadratic formula (x+3)^2=69

Step-by-step explanation:

The given quadratic equation is expressed as

(x + 3)² = 69

(x + 3)(x + 3) = 69

x² + 3x + 3x = 69

x² + 6x - 69 = 0

The general formula for solving quadratic equations is expressed as

x = [- b ± √(b² - 4ac)]/2a

From the equation given,

a = 1

b = 6

c = - 69

Therefore,

x = [- 6 ± √(6² - 4 × 1 × - 69)]/2 × 1

x = [- 6 ± √(36 + 276)]/2

x = [- 6 ± √312]/2

x = (- 6 + 17.7)/2 or x = (- 6 - 17.7)/2

x = 11.7/2 or x = -23.7/2

x = 5.85 or x= - 11.85

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