Answer:
Step-by-step explanation:
Given expression
If this is a perfect square then it should be in the form of:
- (3x)² - 2(3x)(√k) + (√k)²
Comparing the two expressions, we see that:
- (k + 7) = 3√k
- (k + 7)² = 9k
- k² + 14k + 49 - 9k = 0
- k² + 5k + 49 = 0
- D = √(5² -4*49) = √-171
Since the discriminant is negative, there is no solution
