If x=3 is a solution of the equation 2x²-5x+k=0 find the value of k
2 answers:
Answer:
k = - 3
Step-by-step explanation:
Given that x = 3 is a solution then it satisfies the equation, that is
2(3)² - 5(3) + k = 0
2(9) - 15 + k = 0
18 - 15 + k = 0
3 + k = 0 ( subtract 3 from both sides )
k = - 3
Answer: k = -3
Step-by-step explanation:
2x²-5x+k=0
Substitute x=3
2(3)^2-5(3)+k=0
2(9)-15+k=0
18-15+k=0
3+k=0
k=-3
To check if your answer is correct you can substitute x=3 and k = -3
2(3)^2-5(3)-3=0
2(9)-15-3=0
18-15-3=0
3-3=0
So k = -3 is correct
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