Answer:
Step-by-step explanation:
hello :
factor : x²-17x+72
the disciminent delta = b²-4ac when : a=1 and b=-17 and c=72
delta =(-17)²- 4(1)(72) = 289 - 288=1
X1 = (-(-17)-1)/2 X2= (-(-17)+1)/2
X1 = 8 and X2 = 9
so : x²-17x+72 =a(x-x1)(x-X2)
x²-17x+72 = (x-8)(x-9)
