Question

rezolvati in Q ecuatiile(dau coroana)
a)|x+5|=3
b)|2x+1|=7
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Answer 1

Răspuns:

a)|x+5|=3

1) x+5=3 ⇔ x1=-2

2) x+5=-3 ⇔ x2=-8

b) |2x+1|=7

1) 2x+1=7 ⇔ 2x=7-1 ⇔ 2x=6 ⇔ x1=3

2) 2x+1=-7 ⇔ 2x=-7-1 ⇔ 2x=-8 ⇔ x2=-4

Answer 2

Răspuns:

Explicație pas cu pas:

a) |x+5|=3

1) x+5=3

x=3-5

x₁=-2

2) x+5=-3

x=-3-5

x₂=-8

b) |2x+1|=7

1) 2x+1=7

2x=7-1

2x=6

x₁=6/2=3

2) 2x+1=-7

2x=-7-1

2x=-8

x₂=-8/2=-4