Question

Cele 5 exercitii cu tot cu rezolvare. daca raspundeti la misto report!!!
Multumesc anticipat! Dau coroana

Answer 1

a)5x²+7x+2=0
a=5
b=7
c=2
Δ=b²-4ac⇒Δ=49-40⇒√Δ=√9⇒Δ=3
x1x2=-b+-√Δ/2a⇒
x1=-7+3/10⇒-4/10⇒x1= se simplifica prin2=-2/5
x2=-7-3/10⇒-10/10⇒x2=-1

b)3x²-4x-4=0
a=3
b=-4
c=-4
Δ=b²-4ac⇒16+48⇒64⇒√Δ=√64⇒Δ=8
x1x2=-b+-√Δ/2a
x1=4+8/6⇒12/6⇒x1=2
x2=4-8/6⇒-4/6⇒ se simplifica prin 2⇒x2=-2/3

c)x²+2x-1=0
a=1
b=2
c=-1
Δ=b²-4ac⇒4+4⇒8⇒√Δ=√8⇒Δ=2√2
x1x2=-b+-√Δ/2a⇒
x1=-2+2√2/2⇒x1=2√2
x2=-2-2√2/2⇒x2=-2√2

d)-x²-+3x-1=0
a=-1
b=3
c=-1
Δ=b²-4ac=⇒9-4⇒⇒5⇒√Δ=√5
x1x2=-b+-√Δ/2a
x1=-3+√5/2
x2=-3-√5/2

e)-4x²+7x-3=0
a=-4
b=7
c=-3
Δ=b²-4ac⇒49-48⇒√Δ=√1⇒Δ=1
x1x2=-b+-√Δ/2a
x1=-7+1/-8⇒-6/-8 se simplifica prin 2⇒x1=-3/-4
x2=-7-1/-8⇒-8/-8⇒x2=1
⇒sucees