Question

X² - 11,2X + 21,75 = 0

Answer 1

Resolver através da fórmula de Bháskara!
a= x²
b= -11,2x
c= 21,75

x=-b+-√b²-4ac/2a
x= -(-11,2) +-√(11,2)² -4(1)(21,75)/2.1
x= 11,2 +-√125,44 - 87 / 2
x= 11,2 +- √38,44 / 2
x= 11,2 +- 6,2 / 2
x¹ = 11,2+6/2 = 17,4/2 = 8,7    x¹ = 8,7
x² = 11,2-6,2 = 5/2 = 2,5     x² = 2,5