Quadratic Equations Quiz 8

Question 1

The roots of the quadratic equation $(2x+b+a)$ $(2x+b-a)$ = 0 are

Accepted Answer

$-\frac{a+b}{2},\frac{a-b}{2}$

Answer

$\frac{a-b}{2},\frac{a-b}{2}$

Answer

$\frac{a+b}{2},\frac{a+b}{2}$

Answer

$\frac{a+b}{2},\frac{a-b}{2}$

Question 2

The roots of the equation $\sqrt{2x^2+9}=9$ are

Accepted Answer

$x=\pm\,\,6$

Answer

$x=0$

Answer

$x=6$

Answer

$x=-6$

Question 3

The value of k for which 3 is a root of the equation $kx^2-7x+3=0$ is

Accepted Answer

2

Answer

-3

Answer

3

Answer

-2

Question 4

The two roots of a quadratic equation are 2 and &ndash; 1. The equation is

Accepted Answer

$x^2-x-2=0$

Answer

$x^2+x+2=0$

Answer

$x^2-2x+2=0$

Answer

$x^2+2x-2=0$

Question 5

Which constant must be added and subtracted to solve the quadratic equation $9x^2+3x-8=0$ by the method of completing the square ?

Accepted Answer

$\frac{1}{4}$

Answer

$\frac{1}{36}$

Answer

$\frac{9}{64}$

Answer

$\frac{1}{3}$

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