^ это что умножение? . .
Объяснение:
a) 16x^2 - (16x^2 - 40x + 25) = 15
16x^2 - 16x^2 + 40x - 25 = 15
40x - 25 = 15
40x = 15 + 25
40 x = 40
x = 1
б) 64x^2 - (9-48x +64x^2) = 87
64x^2 - 9 + 48x - 64x^2 = 87
-9 + 48x = 87
48x = 87 + 9
48x = 96
x = 2
в) -5x^2 + 15x + 5x^2 - 10x + 5 = -20
-5x^2 + 15x + 5x^2 - 10x + 5 = -20
5x + 5 = -20
5x = -20 - 5
x = -5
в) 4x^2 - 12x + 9 - 4x^2 - 12x = 21
-24x + 9 = 21
-24x = 21 -9
-24x = 12
x = - 1/2
x = -0,5
^ это что умножение? . .
Объяснение:
a) 16x^2 - (16x^2 - 40x + 25) = 15
16x^2 - 16x^2 + 40x - 25 = 15
40x - 25 = 15
40x = 15 + 25
40 x = 40
x = 1
б) 64x^2 - (9-48x +64x^2) = 87
64x^2 - 9 + 48x - 64x^2 = 87
-9 + 48x = 87
48x = 87 + 9
48x = 96
x = 2
в) -5x^2 + 15x + 5x^2 - 10x + 5 = -20
-5x^2 + 15x + 5x^2 - 10x + 5 = -20
5x + 5 = -20
5x = -20 - 5
x = -5
в) 4x^2 - 12x + 9 - 4x^2 - 12x = 21
-24x + 9 = 21
-24x + 9 = 21
-24x = 21 -9
-24x = 12
x = - 1/2
x = -0,5