2. x^2 + 6x+9 : 2x^2+6x-x-3
(x+3)^2 : 2x^2+6x-x-3
(x+3) : 2x(x+3)-(x+3)
(x+3)^2 : (x+3)(2x-1)
Ответ : х+3 : 2х-1
2a(c+d)-5b(c-d) = 2a(c+d)+5b(c+d)=(2a+5b)(c+d)
- x^2 = - 2x
- x^2 + 2x = 0 /:(-1)
x^2 - 2x = 0
x (x - 2) = 0
x1 = 0
y1 = -2*0 = 0
x2 = 2
y2 = -2*2 = - 4
Ответ
( 0; 0)
(2; - 4)
2log2(3)+log7(2)-log7(14)=2log2(3)+log7(2/14)=2log2(3)+log7(1/7)=2log2(3)-1=log2(9)-1
log7(1/7)=log7(7^-1)=-1*log7(7)=-1