#### Question

If the line y =x+k touches the hyperbola 9x^{2} -16y^{2} =144, then k = .............

(A) 7

(B) -7

(C)`+-sqrt7`

(D) `+-sqrt19`

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Solution for question: If the line y =x+k touches the hyperbola 9x^2 -16y^2 =144, then k = concept: Conics - Tangents and normals - equations of tangent and normal at a point. For the courses HSC Arts, HSC Science (Computer Science), HSC Science (Electronics), HSC Science (General)