Grade 12Trigonometry
In a triangle ABC,a=4,b=3,A=60.Then c is the root of the equation - c^2-3c-7=0
- c^2+3c+7=0
- c^2-3c+7=0
- c^2+3c-7=0
In a triangle ABC,a=4,b=3,A=60.Then c is the root of the equation
- c^2-3c-7=0
- c^2+3c+7=0
- c^2-3c+7=0
- c^2+3c-7=0
1 Answer
moumi roy
answer is (a).
using cos rule:a^2=b^2+c^2-2b*c*cosA
putting values:16=9+c^2-2*3*c*(.5)
we get:c^2-3c-7=0
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