Пишите пожалуйста эти уравнения!!!

$1) x^{2} ( x^{2} -15)-16=0 \\ x^{4} -15 x^{2} -16=0 \\ x^{2} =t ;t \geq 0\\ \\ t ^{2} -15t-16=0\\D=225+64=289 \\ \sqrt{D} =17 \\ t _{1} = \frac{15+17}{2} = \frac{32}{2} =16 \\ t _{2} = \frac{15-17}{2} =-1 \\ \\ x^{2} =16 \\ x^{2} -16=0 \\ (x-4)(x+4)=0 \\$

$x-4=0 \to x=4 \\ x+4=0 \to x=-4$

$2) x- \sqrt{2-x} =0 \\ - \sqrt{2-x} =-x \\ \sqrt{2-x} =x \\ \\ 2-x= x^{2} \\ x \geq 0 \\ \\ 2-x= x^{2} \\ 2-x- x^{2} =0 \\ - x^{2} -x+2=0/*(-1) \\ x^{2} +x-2=0\\D=1+8=9 \\ \sqrt{D} =3 \\ x_{1} = \frac{-1+3}{2} = \frac{2}{2} =1 \\$

$x_{2} = \frac{-1-3}{2} = \frac{-4}{2} =-2 \\$

x=1