if a = 3 and b = -5 then what is ab²-ac
Answers
Answered by
0
Step-by-step explanation:
(3)(25)-(3)(c) = 0
75 -3c = 0
75 = 3c
75/3 = c
c = 25
Answered by
1
Answer:
Given :
In ∆ABC ,
AB/1 = AC/2 = BC/√3
Let AB/1 = AC/2 = BC/√3 = k
AB = k , AC = 2k , BC = √3k ,
AB² = k² ,
AC² = 4k² ,
BC² = 3k²
Now ,
AB² + BC² = AC²
Therefore ,
<B = 90°
[ By Converse of Phythogarian theorem ]
In ∆ABC,
Sin C = AB/AC
=> SinC = k/2k
=> Sin C = 1/2
=> Sin C = sin 30°
=> C = 30°
Option ( b ) is correct.
Step-by-step explanation:
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