Question

Решить уравнение (15-|x|)(x2-144)(0.3x-9)=0

Answer 1

$(15-|x|)( x^{2} -144)(0.3x-9)=0 \\ 15-|x|=0 \\ -|x|=-15 \\ |x|=15 \\ x=15\\x=-15 \\ \\ x^{2} -144=0 \\ x^{2} =144 \\ x=12\\x=-12 \\ \\$

$0.3x-9=0 \\ 0.3x=9 \\ x=30$

Answer 2

1)
(15+x)(x-12)(x+12)(0,3x-9)=0
x=-15 x=12  x=-12  x=30
2)
(15-x)(x-12)(x+12)(0,3x-9)=0
x=15 x=12  x=-12  x=30
x={-15;-12;12;15;30}