Question

qual o resultado de: 5x-3 (x mais 2):15

Answer 1

5x - 3x + 6: 15
2x + 2/5=0
10x + 2=0
x= -2/10
x= -1/ 5

Answer 2

5x -3 (x+2) = 15
5x (x+2) = 15 +3
5x (x+2) = 12
5x² + 15x = 12
5x² + 15x -12 = 0
Ai tu faz bhaskara, sendo a=5, b=15 e c =12
Delta = b² -4ac
Delta = 15² - 4.5.(-12)
Delta = 225 - 4.5.(-12)
Delta = 225 - (-240)
Delta = 225 + 240
Delta = 465

X = -b +/- raiz de delta/2a
X = -15 +/- raiz de 465/2.5
X = -15 +/- 21,5/10
X1 = -15 + 21,5/10
X1 = 0,65
X2 = -15 -21,5/10
X2 = -3,65