2x+4>0⇒2x>-4⇒x>-2
x+1≠0⇒x≠-1
x∈(-2;1) U (1;≈)
1. (3ⁿ+3ⁿ⁻¹)²=(3ⁿ+3ⁿ/3)²=(3ⁿ+(3ⁿ/3))²=((3*3ⁿ+3ⁿ)/3)²=(4*3ⁿ/3)²=(4*3ⁿ⁻¹)²=16*3²ⁿ⁻².
2. 9ⁿ⁻¹=3²*⁽ⁿ⁻¹⁾=3²ⁿ⁻².
3. 16*3²ⁿ⁻²/3²ⁿ⁻²=16.
<span>а)f(x)=x²-6x+4=(x-3)²-5 (3;-5)
б)f(x)=-x²-4x + 1=(x-2)²-3 (2;-3)
в)f(x)=3x²-12x+2</span>=3(x-2)²-10 (2;-10)