Answer:
x² + 1 = 0
a = 1
b = 0
c = 1




There is no real solution because the discriminant is negative
Note.
Formula diskriminan
√b² - 4ac.
if the diskrimanan is negatif, so the quadratic equatoin dont have solution
1 is 4a+15b
2 is 5x-4
3 is 2x-22
4 is 8x-21
5 is 25x + 55
6 is 55x - 17
The answer is 5.
17=(2x+2)+x
X is the length of the shorter piece and 2x+2 is two plus double the length of the shorter piece or X
X=5
192-78=114
But when you round it the answer is 110.