11. x2 + x + 9 = 20 Solve equation using the quadratic formula write in irrational solutions in simplest radical form

problem 1: x^2 + 4 = 0 , x^2 = -4 , this problem has no real solution because x = 2i which is an imaginary number

problem 2: x^2 +x -6 = 0 , (x + 3)(x - 2) =0 , x = 2 or x = -3

problem 3: x^2 -6x +7 =0 , (x^2 -6x +9) - 2 =0 , (x - 3)^2 = 2 , x-3 = √2 , x = 3+√2 or x - 3 = -√2 , x = 3 - √2

this gave me 4 marks

Step-by-step explanation:

scale factor = 18/10   = 1.8

AC = 15 x 1.8 = 27

So x = 17

15+3=18

18/15= 1.2

scale factor= 1.2

10x1.2= 12

12-10=2

x=2