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Black Advanced Problems in Mathematics
Exam
Black Advanced Problems in Mathematics
Subject
Mathematics
Chapter
Quadratic Equation

Black Advanced Problems in Mathematics · Mathematics · Quadratic Equation

For real numbers x and y, if x^2 + xy - y^2 + 2x - y + 1 = 0 , then...

For real numbers x and y, if x2+xy−y2+2x−y+1=0x^2 + xy - y^2 + 2x - y + 1 = 0, then :

Options

  1. Ay can not be between 00 and 85\frac{8}{5}
  2. By can not be between −85-\frac{8}{5} and 85\frac{8}{5}
  3. Cy can not be between −85-\frac{8}{5} and 00
  4. Dy can not be between −165-\frac{16}{5} and 00.

Correct answer

C. y can not be between −85-\frac{8}{5} and 00

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