👤

Determinați soluțiile ecuatiilor:
a) 2x^2+5=7
b) 4x^2-2=0
c) 19x^2+18=17
d)2x^2 =1-(-1)^2010
e) 2 (x+1)^2+4=10


Răspuns :

a) 2x² + 5 = 7
2x² = 7-5
2x² = 2
x² = 1
x = +- 1
x₁ = -1
x₂ = 1

b) 4x² - 2 = 0
4x² = 2
x² = 2/4
x² = 1/2
x = +- √2 / 2
x₁ = √2 / 2
x₂ = - √2 / 2

c) 19x² + 18 = 17
19x² = 17-18
19x² = -1
x² = - 1/19
x = +- √-1/19

d)  2x² = 1-(-1) la puterea 2010
2x² = 1-1
2x² = 0
x = 0

e) 2 ( x+1 )² +4 = 10
2 ( x+1)² = 10-4
2 ( x+1)² = 6
( x+1 )² = 3
x+1 = +-3
x+1 = +-√3
x+1 = √3
x+1 = -√3
x₁ = -√3-1
x₂ = √3-1

Sper ca te-am ajutat si bafta la scoala !!!

a) 2x²+5=7
2x²=7-5
2x²=2
x²=2:2
x²=1
x²=1²
x=1

b) 4x²-2=0
4x²=2
x²=2:4
x²=1/2
x=√1/√2
x=1/√2

c) 19x²+18=17
 19x²=17-18
 19x²=-1
x²= -1 /19
x= - √1/√19
x= - 1/√19

d)2x² =1-(-1)²⁰¹⁰
2x²=1-1
2x²=0
x²=0
x=0

e) 2 (x+1)²+4=10
2 (x+1)²=10-4
2 (x+1)²=6
 (x+1)²=6:2
 (x+1)²=3
x+1=√3
x=√3-1