Question

Помогите пожалуйста даю 14 балов

Answer 1

$5 {}^{x {}^{2} + x - 5 } = \frac{1}{125} \\ 5 {}^{x {}^{2} + x - 5 } = 5 {}^{ - 3} \\ x {}^{2} + x - 5 = - 3 \\ x {}^{2} + x - 2 = 0 \\ d = 1 - 4( - 2) = 1 + 8 = 9 \\ x1 = \frac{ - 1 + \sqrt{9} }{2} = \frac{2}{2} = 1 \\ x2 = \frac{ - 1 - \sqrt{9} }{2} = \frac{ - 4}{2} = - 2$

Answer 2

5^(-3)=1/125
 То есть x^2+x-5=-3
x^2+x-2=0
D=1-4*(-2)=9
x1=(-1+3)/2=1
x2=(-1-3)/2=-2