abramdent
17.10.2019 •
Mathematics
One of the solutions to x2 − 2x − 15 = 0 is x = −3. what is the other solution?
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Ответ:
sum of roots = -b/a = -(-2)/1 = 2
-3 + other solution = 2
other solution = 2 + 3
other solution = 5
Ответ:
x = 5
Step-by-step explanation:
To find the other solution of a quadratic equation, one of the options available to solving it is by factorization.
Given;
x2 − 2x − 15 = 0
x2 - 5x + 3x - 15 = 0
x(x - 5) +3(x - 5) = 0
(x + 3)(x - 5) = 0
x = -3 or x = 5
Given that x = −3 is one of the options, the other is x = 5
Ответ:
-7.8 i think
Step-by-step explanation: