Пошаговое объяснение:
а)
х² +(5- x)(5+x) = 100х;
х² + 25 + 5x - 5x - х² = 100x
100x = 25
x = 25 : 100
x = 0,25
б)
(4х +1)²-16(х + 2)(х-2) = 17.
16х² + 8x + 1 -16(х²- 4) = 17
16х² + 8x + 1 - 16х² + 64 = 17
8x + 65 = 17
8x = 17 - 65
8x = -48
x = -48 : 8
x = -6
Пошаговое объяснение:
а)
х² +(5- x)(5+x) = 100х;
х² + 25 + 5x - 5x - х² = 100x
100x = 25
x = 25 : 100
x = 0,25
б)
(4х +1)²-16(х + 2)(х-2) = 17.
16х² + 8x + 1 -16(х²- 4) = 17
16х² + 8x + 1 - 16х² + 64 = 17
8x + 65 = 17
8x = 17 - 65
8x = -48
x = -48 : 8
x = -6