<span>y=-3x+1
</span><span>A(b+3; 2-b)
2-b = -3(b+3) + 1
</span>2-b = -3b - 9 + 1
-b+3b = -8-2
2b = -10
b = -5
Ответ: при b = -5
А) x³-9x=x(x²-9)=x(x-3)(x+3)
б) -5a-10ab-5b²=-5(a+2ab+b²)= -5(a+b)²
в) 2x²-2y²+3x-3y=2(x²-y²)+3(x-y)=2(x-y)(x+y)+3(x-y)=
=(x-y)(2(x+y)+3)=(x-y)(2x+2y+3)
г) d²+6d+9-x²=(d+3)²-x²=(d-x+3)(d+x+3)