Question

864 = x kuadrat + (4x . 18)
X = ?

Answer 1

864 = x²+(4x.18)

864 = x² +72x

-x² - 27x + 864 = 0

x² + 27x - 864 =0

a=1, b=72, c=-864

x = b +/- √-b² -4ac / 2a

x = -72+/- √72² - 4 × 1 × (-864) / 2.1

x = -72 +/- √5184 - 3456 / 2

x = -72 +/- √8640 / 2

x = -72 + 24√15 / 2

x = -72 - 24√15 / 2

x = -36 + 12√15
x = -36 - 12√15