Page 26 - CHAPTER 4 (Quadratic equations)

CHAPTER 4

QUADRATIC EQUATIONS

Practice Yourself

1 Mark Questions

1. Which of the following equations has imaginary roots :

(1) x²-4x+2=0 (2) 3x²+2x-1=0

(3) x²-4x-2=0 (4) x²+x+1=0

2. If –4 is a root of the quadratic equation x²+px-4=0 and the quadratic

equation x²+px+k=0 has equal roots, the value of k is

(1) 3/4 (2) 5/4

(3) 7/4 (4) 9/4

3. One year ago, a man was 8 times as old as his son. Now his age is

equal to the square of his son’s age. their present ages are

(1) 7 years, 49 years (2) 8 years, 48 years

(3) 9 years, 50 years (4) 10 years, 51 years

4. The value of a such that = 3 is a solution of the equation

ax²+2x+3=0 is

(1) 0 (2)1

(3) 2 (4)–1

2
5. Perimeter of a rectangle is 82 m, and its area is 400 m . The length
of its diagonal is

(1) √880 (2) √881

(3) √882 (4) √883

26