Question

15=x2-100=0
16=X2+8x+15=0
17=X2+7x+12=0
18=x2-6x+8=0
19=x2-9x+20=0
20=X2+6x+5=0
Me ajudem por favor

Answer 1

Bom dia

x² - 100 = 0 , (x - 10)*(x + 10) = 0,  x1 = 10, x2 = -10

x² + 8x + 15 = 0, (x + 5)*(x + 3) = 0, x1 = -5, x2 = -3

x² + 7x + 12 = 0, (x + 3)*(x + 4) = 0. x1 = -3, x2 = -4

x² - 6x + 8 = 0, (x - 2)*(x - 4) = 0, x1 = 2, x2 = 4 

x² - 9x + 20 = 0, (x - 5)*(x - 4) = 0, x1 = 5, x2 = 4

x² + 6x + 5 = 0, (x + 1)*(x + 5) = 0, x1 = -1, x2 = -5