If x2 - 7x = 0; the value of x is :
0 and 7
7
0
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 4 is a root of the equation x2 + kx - 4 = 0; the value of k is :
3
-3
2
-2
The equation 2x2 - 3x + k = 0 is satisfied by x = 2; the value of k is :
4