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Two perpendicular line, L1 and L2, pass through the point A(-2, -5). The gradients of the lines are the roots of the equation 30x^2 - 11x + k= 0. where the k is constant. Find:
(a). the value of k
(b). the area of the triangle bounded by L1, L22 and the x-axis

Question

Need help! 

Two perpendicular line, L1 and L2, pass through the point A(-2, -5). The gradients of the lines are the roots of the equation 30x^2 - 11x + k= 0. where the k is constant. Find: 
(a). the value of k
(b). the area of the triangle bounded by L1, L22 and the x-axis

goformit100 · Answer

@MathSucks42 @mathcalculus @Math81

ankit042 · Answer

Let us assume slope of L1 as m then slope of L2 will be -1/m
Now m and 1/m satisfy the quadratic equation solve for m from there 
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ankit042 · Answer

@huiyingtanyayap  can you solve from here?

anonymous · Answer

i can't =( , can you show me?

ankit042 · Answer

30m^2 - 11m + k = 30(-1/m)^2+11/m +k solve for m from here

ankit042 · Answer

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