allerySolve x² − 2x − 4 = 0.
A1 ± √5
B2 ± √5
C−1 ± √5
D−2 ± √5
Answer & Solution
Correct answer: A. 1 ± √5
D = 4 + 16 = 20. x = (2 ± √20)/2 = (2 ± 2√5)/2 = 1 ± √5.
Keep practising Quadratic Equations
Browse all Quadratic Equations questions for Andhra Pradesh SSC (Class 10), or explore more Mathematics topics.
Related questions
The area of a rectangle is 60 sq cm and length exceeds breadth by 4 cm. Breadth isSolve by completing the square: x^2 + 6x + 5 = 0. Roots areIf alpha and beta are roots of x^2 - 7x + 10 = 0, then alpha + beta + alpha*beta equalsA train covers 360 km at uniform speed. If the speed were 5 km/h more, it would take 1 houThe product of two consecutive positive odd numbers is 143. The numbers areIf one root of x^2 - 6x + k = 0 is 2, then k equalsThe sum of squares of two consecutive positive integers is 113. The integers areFor what k does x^2 + kx + 9 = 0 have equal roots?