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Afine123456
a fost răspuns

Cat fac x la a doua -9x +14=0 ?

Răspuns :

ElaLucy
x²-9x+14=0

Δ=b²-4ac

Δ=(-9)^2 -4 *1 * 14

Δ=81-56

Δ=25

x1,2= (-b +/- √Δ)/2a

x1=(9 - √25)/2*1= (9-5)/2=4/2=2

x2=(9+√25)/2*1= (9+5)/2= 14/2=7

S={2;7}
CosmoteRo
este :(x+2)(x+7)
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