CH 4 Quadratic equation

The roots of quadratic equation 5x² – 4x + 5 = 0 are

• Real & Equal

• Real & Unequal

• Not real

• Non-real and equal

Equation (x+1)² – x² = 0 has _____ real root(s).

• 1

• 2

• 3

• 4

Which constant should be added and subtracted to solve the quadratic equation 4x² − √3x + 5 = 0 by the method of completing the square?

• 9/16

• 3/16

• 3/4

• √3/4

If 1/2 is a root of the equation x² + kx – (5/4) = 0 then the value of k is

• 2

• -2

• 3

• -3

A natural number, when increased by 12, equals 160 times its reciprocal. Find the number.

• 3

• 8

• 4

• 7

The product of two successive integral multiples of 5 is 300. Then the numbers are:

• 25, 30

• 10, 15

• 30,35

• 15,20

• 3.5

• 4

• 3

• -3

If p²x² – q² = 0, then x =?

• ± q/p

• ±p/q

• p

• q

• 3

• 5

• 4

• 7

If x² (a² + b²) + 2x (ac + bd) + c² +d² = 0 has no real roots, then

• ad≠bc

• ad<bc

• ad>bc

• all of these