find the value of k for which the line y= kx - 10 meets the curve x2 + y2=10x
Answers
Answered by
1
Answer:
4x
Step-by-step explanation:
x2+y2=10x
y2= 10x-2x
2y= 8x
y= 8x/2
y=4x
Answered by
7
Answer:
k ≥ 0.75
Step-by-step explanation:
²+y²=10
²+(k-10)²=10
² + (k)²-2 x k x 10 +10²=10
²+k² ²-20k+100-10=0
(1 + k²)² - (20+ 10) + 100= 0
according to the question:
b² - 4ac ≥ 0
[-(20k + 10)]²-4 x ( 1+k²) x 100≥0
(20k)²+ 2 x 20k x 10 + 10² -400 - 400k² ≥0
400k² + 400k +100 -400-400k ≥0
400k-300≥0
400k≥300
k≥300/400
k≥0.75
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