If the equation (a²+b²)x²−2(ac+bd)x+c²+d²=0 has equal roots, then:

(a) ad = cd

(b)  ad = bc

(c) \(ad=\sqrt{bc}\)

(d) \(ab=\sqrt{cd}\)  

If the equation x² + 4x + k = 0 has real and distinct roots, then:

(a) k < 4

(b)  k > 4  

(c) k > 4 

(d)  k < 4

If one root of the equation 2x²−10x+p=0 is 2, then the value of p is:

(a) −3

(b) −6

(c) 9

(d) 12

If ax² + bx + c = 0 has equal roots, then c is equal to:

(a) \(-\frac{b}{2a}\)

(b) \(\frac{b}{2a}\)

(c) \(-\frac{b^2}{4a}\)

(d) \(\frac{b^2}{4a}\)

If ½ is a root of the equation \(x^2+kx-\frac{5}{4}=0\), then the value of k is: 

(a) 2

(b)  – 2

(c) \(\frac{1}{4}\)

(d) \(\frac{1}{2}\)

Which of the following is a quadratic equation?  

(a) \(x^2+2x+1=(4-x)^2+3\)

(b) \(-2x^2=(5-x)(2x-\frac{2}{5})\)

(c) \((k+1)x^2+\frac{3}{2}x=7\), where k=−1

(d) \(x^3-x^2=(x-1)^3\)

For what value of k, x = 2 is a solution of kx² + 2x – 3 = 0?

(a) \(k=-\frac{1}{2}\)

(b) \(k=\frac{1}{2}\)

(c) \(k=-\frac{1}{4}\)

(d) \(k=\frac{1}{4}\)

Which of the following is a root of the equation 2x² – 5x – 3 = 0?  

(a) x = 3

(b) x = 4

(c) x = 1

(d) x = –3 

If x = 2 is a root of the equation 3x² – 2kx + 5 = 0, then k is equal to:

(a) \(\frac{4}{17}\)

(b) \(\frac{17}{4}\)

(c) \(\frac{1}{17}\)

(d) \(\frac{1}{4}\)

If x = 1 is a common root of the equations ax² + ax + 3 = 0 and x² + x + b = 0, then ab is equal to:

(a) 3

(b) 3.5

(c) 6

(d) – 3