A2=a1+d(n-1)=-25+6(2-1)=-25+6=-19
1) 6 x - 10,2 = 4 x = - 2,2 x/0,2
2 x = 8 X = 4
2) 15 - ( 3 x - 3) = 5 - 4 x - 3 x + 4 x = 5 - 15 - 3 x = - 13
3) 2 x - 1 + 1 = 9
2 x = 9 + 1 - 1
2 x = 9
X = 4, 5
<span>5x^2+ 3x + c=0
D=9-20c
√D=√9-20c
x1=(-3-(√9-20c)/10
x2=(-3+√9-20c)/10
</span>
<span>у√х^2= y|x|=(2+</span>√7)|2-√7|=(2+√7)(√7-2)=7-4=3
X+√ x² + 26х+169, при х ≤ -13x+√ x² + 26х+169=x+√(x+13)²=x+x+13=2x+13