Asap
what are the solutions of the quadratic equation (x – 8)2 – 13(x – 8) + 30 = 0? use u substitution to solve.
x = –11 and x = –18
x = –2 and x = 5
x = 2 and x = –5
x = 11 and x = 18

x = 11 and x = 18

Step-by-step explanation:

Let assume u=x-8

We replace all 'x-8' by 'u'

So equation becomes

Now we factor the left hand side

-10  and -3 gives us product 30

-10  and -3 gives us sum -13

(u-10) (u-3) =0

Now solve for 'u'

u-10 = 0 so u =10

u-3 =0 so u=3

We assumed x-8 = u

Plug in 'u' values and solve for x

u =10

x-8= 10

Add 8 on both sides, x= 18

u =3

x-8= 3

Add 8 on both sides, x= 11

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3