Question

Resolva as equações do segundo grau usando a fórmula de bhaskara

A, -3x²-7x+2=0

B, 3x²+2x-5=0

C, x²-10x+25=0

D, -x²+x+12=0

E, x²-5x6=0

F, y²-8y+16=0

Answer 1

-3x²-7x+2=0
a= (-3) b=(-7) c=2
Δ= b²-4.a.c
Δ= (-7)²-4.(-3).2
Δ= 49-24
Δ=25
√Δ= √25= 5

x= -b+-√Δ /2.a
x= -(-7)+-5 /2.(-7)

x'= +7+5 /14
x'= 12/14 ÷ 2
x'= 6/7

x''= +7-5/14
x''= 2/14 ÷2
x''= 1/7