Question

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10. What is the sum of the roots of the quadratic equation x² - 2x - 15 = 0?
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Answer 1

Answer:

2

Step-by-step explanation:

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

Sum of roots:-

$- 3 + 5 = 2$

Hope it helps you!

Answer 2

Step-by-step explanation:

GIVEN THAT

$x {}^{2} - 2x - 15$

$x {}^{2} + 3x - 5x - 15$

$x(x + 3) - 5( x + 3)$

$(x - 5)(x + 3)$

X = 5,-3

sum of roots = 2