Question

what is the sum of the roots of the quadratic equation x^2-2x-15=0
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Answer 1

Answer:

${x}^{2} - 2x - 15 = 0 \\ {x}^{2} - 5x + 3x - 15 = 0 \\ x(x - 5) + 3(x - 5) = 0 \\ (x + 3)(x - 5) = 0 \\ \\ x + 3 = 0 \\ x = - 3 \\ \\ x - 5 = 0 \\ x = 5$

I hope it helps you

Answer 2

Answer:

The sum of the roots will be 5 + (-3) = 2