Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET202419 May 2024Evening ShiftMathematicsQuadratic EquationActual

If x^2+5 a x+6=0 and x^2+3 a x+2=0 have a common root then that common root is

Options

  1. A3 (or) -3
  2. B2 (or) -2
  3. C2 (or) -3
  4. D-2 (or) 3

Correct answer

B. 2 (or) -2

Step-by-step solution

Let y be a common root of x^2+5 a x+6=0 and x^2+3 a x+2=0 So, y^2+5 a y+6=0 and y^2+3 a y+2=0 5 a y+6=3 a y+2 2 a y=-4 a y=-2 So, y^2+5 (-2)+6=0 y^2-4=0 y= 2 .

Practice Quadratic Equation on Quantrex Academy →

More from Quadratic Equation

If is the common root of the quadratic equations x^2-5 x+4 a=0 , x^2-2 a x-8=0 , where a R , then the value of ^4- ^3+68 is 2025If , are the roots of x^2-5 x-6 =0 and , are the roots of x^2-5 x-6 =0 , then + + + = 2025If , , are the roots of the equation x ^3+ px ^2+ qx + r =0 , then ( + )( + )( + )= 2025Let f(x)=x^2+2 b x+2 c^2 and g(x)=-x^2-2 c x+b^2, x R . If b and c are nonzero real numbers such that f(x)> g(x) , then | c b | lies in the interval 2025If x ^2-4 ax +5+ a >0 for all x R whenever a ( , ) , then 4 + = 2025If , , are the roots of the equation x^3-12 x^2+k x-18=0 and one of them is thrice the sum of the other two roots, then ^2+ ^2+ ^2-k= 2025The polynomial equation of degree 5 whose roots are the roots of the equation x^5-3 x^4-x^3+11 x^2-12 x+4=0 each increased by 2, is 2025If the difference of the roots of the equation x^2-7 x+10=0 is same as the difference of the roots of the equation x ^2-17 x + k =0 , then a divisor of k is 2025 Full Quadratic Equation list All AP EAMCET PYQs