Question

calcule mentalmente as raízes das equações a) X² -7x+10=0
b)X²-14x+48=0

Answer 1

 a)X² -7x+10=0

Δ=(-7)²-4.1.10
Δ=49-40
Δ=9

X=-b+-√9/2.1

X1=7+3/2=5
X2=7-3/2=2              S={5,2}



b)X²-14x+48=0

Δ=(-14)²-4.1.48
Δ=196-192
Δ=4

X=-(-14)+-√4/2.1

X1=14+2/2=8
X2=14-2/2=6        S={8,6}

Answer 2

Bom dia 

a) x² - 7x + 10 = 0
    
    x1 = 2 , x2 = 5

b) x² -14x + 48 = 0

    x1 = 6, x2 = 8