x=-4
Объяснение:
(4-x)(4+x)=(2x+5)^2-9
16-x^2=4x^2+20x+25-9
16-x^2=4x^2+20x+16
-x^2=4x^2+20x
-5x^2=20x
-5x=20
x=-4
Объяснение:
(4-x)(4+x)=(2x+5)^2-9
16-x^2=4x^2+20x+25-9
16-x^2=4x^2+20x+16
-x^2=4x^2+20x
-5x^2=20x
-5x=20
x=-4