The sum of the x-coordinates of the intersection of x² + y²= 36 and x² -y² = 6, is ______. A. - 2√ 21 B. 0 C. 2√ 15 D. 2√ 21
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Hey mate!
Here's your answer!
Sum of the coordinates = x²+y²-36+x²-y²- 6 = 0
=> 2x²-42 = 0
=> x²-21 = 0
=> x² = 21
=> x = √21
Sum of the coordinates of intersection = x+x
=> 2x
=> 2√21.
Hence, D is the answer.
Hope it helps :)
Here's your answer!
Sum of the coordinates = x²+y²-36+x²-y²- 6 = 0
=> 2x²-42 = 0
=> x²-21 = 0
=> x² = 21
=> x = √21
Sum of the coordinates of intersection = x+x
=> 2x
=> 2√21.
Hence, D is the answer.
Hope it helps :)
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