If x2 - 7x = 0, the value of x is :
7
0
0 and 7
0 or 7
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Given,
⇒ x2 - 7x = 0
⇒ x(x - 7) = 0
⇒ x = 0 or x - 7 = 0
⇒ x = 0 or x = 7.
Hence, Option 4 is the correct option.
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If the quadratic equation kx2 + kx + 1 = 0 has real and distinct roots, the value of k is :
4
0 and 4
0 or 4
If x2 - 4x = 5, the value of x is :
5
-1
5 or -1
5 and -1