. 5 - (1+√2)²=5-(1+2√2+2)=5-1-2√2-2=2-2√2
2. (√3-2)²-6= 3-4√3+4-6= 1-4√3
X^2 -4x-x+7 =0
X^2 - 5x +7 =0
D= -5^2 - 4 *1 * 7 = -3
Корней нет!
1. sin2x= 1/2
2x = (-1)^k+1*arcsin 1/2 + π*n
2x = (-1)^k+1*π/6 + π*n
x = (-1)^k+1*π/12 + π/2*n
Ответ: <span>(-1)^k+1*π/12 + π/2*n
2. log2(3+x)=7
</span><span>log2(3+x)=2^7
</span><span> 3+x=128
x=125
3. </span>√(63-6x)=3
√(63-6x)²=3²
<span>63-6x=9
6x=54
x=9
4. 3^x+9= 1/9
</span><span>3^x+9= 3^-2
x+9=-2
x= -11</span>