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a fost răspuns

Descompuneti in factori:
a) x la 2+7x+12=
b)x la 2+9x+14=

Răspuns :

a)x²+7x+12=
a=1
b=7
c=12
Δ=b²-4ac
Δ=49-48=1
x1=(-b+√Δ)/2a=(-7+1)/2=-3
x2=(-b-√Δ)/2a=(-7-1)/2=-8/2=-4
x²+7x+12=(x+3)(x+4)

b)x²+9x+14=(x+2)(x+7)
Δ=81-56=25
x1=(-9+5)/2=-2
x2=(-9-5)/2=-7

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