Question

equacao de segundo grau :
a- -x^2 +7×+30=0
b- 2x^2-3×-2=0
me ajudem pelo amor de deus!!!!!!

Answer 1

a) -x^2+7x+30=0 (-1)
x^2-7x-30=0
/\=(-7)^2-4.1.(-30)
/\=49+120
/\=169
x=-(-7)+-\/`169/2.1
x=7+-13/2
x'=7-13/2
x'=-6/2
x'=-3
x"=7+13/2
x"=20/2
x"=10

b) 2x^2-3x-2=0
/\=(-3)^2-4.2.(-2)
/\=9+16
/\=25
x=-(-3)+-\/`25/2.2
x=3+-5/4
x'=3-5/4
x'=-2/4
x'=-1/2
x"=3+5/4
x"=8/4
x"=2