x2 - 8x + 15 = 0 can be factored as (x - 3)(x - 5) = 0 : This holds true when one or both of the terms in brackets equals zero.
When x - 3 = 0 then x = 3
When x - 5 = 0 then x = 5.
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A=0 b=0 c=0
0 divided by15 = 0 15 divided by 0 is undetermined ( infinite)
no 3x2=6 then 4x-15= -60 so 6 added with - 60 = -54
x2+24x+144 = 9 x2+24x+144-9 = 0 x2+24x+135 = 0 (x+9)(x+15) = 0 x = -9 or x = -15
it equals 4.5 :0