Page 40 - CHAPTER 4 (Quadratic equations)

CHAPTER 4

QUADRATIC EQUATIONS

EXERCISE

MCQ’s

3
6
1. Values of x satisfying the equation: x -26x -27=0 are:
(A) -1,3 (B) 1,3 (C) 1,-3 (D) -1,-3

2. Values of x satisfying the equation: √2x+9+x=13 are:

(A) 4,16 (B) 8 (C) 2 (D) 8,20

3. Values of x satisfying the equation: √2x+9 - √x-4=3 are:

(A) 4,16 (B) 8,20 (C) 2,8 (D) 1,2

1
1
2
4. Values of x satisfying the equation: 2[x + ]-9[x+ ]+14=0 are:
x 2 x
(A) ½,1,2 (B) 1/3, 2,4 (C) 1/3, 4,1 (D) 2,3,5
2
2
5. Values of x satisfying the equation: √x +x-6 -x+2=√x -7x+10 are:
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(A) 2,6,- (B) 2,6 (C) -2,-6 (D) 1,2,3
3
2
2
2
6. The number of real roots of the equation: (x-1) +(x-2) +(x-3) =0
(A) 0 (B) 2 (C) 3 (D) 6

7. Values of x satisfying the equation: (x+2)(x-5)(x-6)(x+1)=144 are:

(A) -1,-2,-3 (B) 7,-3,2 (C) 2,-3,5 (D) 4,5,6

2
8. Consider the quadratic polynomial f(x)= ax -x+c such that ac>0
and its graph lies below x axis, then

(A) a<0,c>0 (B) a<0, c<0 (C) a>0,c>0 (D) a>0,c<0

2
9. If , are the roots of a quadratic equation x -3x+5=0, then the
2
2
equation whose roots are α -3α+7 and β -3β+7 is:
2
2
(A) x +4x+1 (B) x -4x+4=0
2
2
(C) x -4x-1=0 (D) x +2x+3=0
2
10. The value of the expression x +2bx+c will be positive for all real x, if

(A) b -4c>0 (B) b -4c<0 (C) c <b (D) b <c
2
2
2
2

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