if the qudratic equation x2+4x+k=0 has a real and distinct root find the value of k
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compare x² + 4x + k = 0 with ax² + bx + c = 0
a = 1 , b = 4 , c = k
it is given that roots are distinct and real ,
discreaminant ≥ 0
b² - 4ac ≥ 0
4² - 4 × 1 × k ≥ 0
- 4k ≥ - 16
4k ≤ 16
k ≤ 16/4
k ≤ 4
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