Antwoord:
# => w = (-4 pm 4sqrt 26) / 5 #
Uitleg:
# 5w ^ 2 + 8w = 80 #
# => 5w ^ 2 + 8w - 80 = 0 #
Gebruik nu de quadratics-formule:
#w = (-b pm sqrt (b ^ 2-4ac)) / (2a) #
Waar #a = 5, b = 8, c = -80 #
# => w = (-8 pm sqrt (8 ^ 2 - (4 * 5 * -80))) / (2 * 5) #
# => w = (-4 pm 4sqrt 26) / 5 #