732
по формуле: (a-b)² = a² - 2ab + b²
x² = 12x + 36 = x² -6x + 9
-12x + 36 = -6x + 9
-12x + 6x = 9 - 36
-6x = 27
x =
x = 4,5
733
по формуле: (a-b)² = a² - 2ab + b²
x² - 18x + 81 = x² + 8x + 16
-18x + 81 = 8x + 16
-18x - 8x = 16 - 81
-26x = -65
x =
x = 2,5
734
по формуле: (a+b)² = a² + 2ab + b²
x² + 4x + 4 = x² - 12x + 36
4x + 4 = -12x + 36
4x + 4 = + 12x - 36 = 0
16x - 32 = 0
x - 2 = 0
x = 2
735
по формуле: (a-b)² = a² - 2ab + b²
x² - 12x + 36 = x² + 14x + 49
-12x + 36 = 14x + 49
-12x - 14x = 49 - 36
-26x = 13
x = -
x = -0,5
736
по формуле: (a+b)² = a² + 2ab + b²
x² + 12x + 36 = x² + 18x + 81
12x + 36 = 18x + 81
12x - 18x = 81 - 36
-6x = 45
x = -
x = -7,5
737
|7-x| = |x+3|
7 - x = x + 3
7 - x = -(x + 3)
x = 2
x ∈ ∅
x = 2
738
|x-1| = |14-x|
x - 1 = 14 - x
x - 1 = -(14 - x)
x =
x ∈ ∅
x =
x = 7,5
739
по формуле: (a-b)² = a² - 2ab + b²
x² - 14x + 49 = 81 - 18x + x²
-14x + 49 = 81 - 18x
-14x = 49 - 81 + 18x = 0
4x - 32 = 0
x - 8 = 0
x = 8
740
по формуле: (a+b)² = a² + 2ab + b²
x² + 20x + 100 = 4 - 4x + x²
20x + 100 = 4 - 4x
20x + 100 - 4 + 4x = 0
24x + 96 = 0
x + 4 = 0
x = -4
741
|x+9| = |10-x|
x + 9 = 10 - x
x + 9 = -(10 - x)
x =
x ∈ ∅
x =
x = 0,5
742
-2x² - 2x + 5 = -x² - x - (1 - x²)
-2x² - 2x + 5 = -x² -x - 1 - x²
-2x² - 2x + 5 = 2x² - x - 1
-2x + 5 = -x - 1
-2x + x = - 1 - 5
-x = -6
x = 6