Question

Determine the solutions to the quadratic equation -5x2 + 10x + 15 = 0.

Answer 1

You the quadratic formula or graph it

Answer 2

*use

Answer 3

x = [-b +- sqrt(b² - 4 * a * c)] / 2 * a
x = [-10 +- sqrt(100 - 4*-5*15)] / 2 * -5
x = [-10 +- sqrt (100 - -300)] / -10
x = [-10 +-sqrt(400)] / -10
x = [-10 +-20]/ -10

x = -10 + 20 / -10 = -1

x = -10 -20 / -10 = 3