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Find the value of k and X2:

X^2+10x+k=0. X1=-7
Step by step solutions

1 answer

1. Substitute the value of X1 into the equation:
X^2+10x+k=0
-7^2+10(-7)+k=0

2. Simplify the equation:
49-70+k=0

3. Solve for k:
k=21
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