Ответ:

Объяснение:

(x-4)² - 6 =x²-8x+16-6=x²-8x+10

10a + (a-5)² = 10a+a²-10a+25=a²+25

(3m-7n)² -9m (m-5n) = 9m²-42mn+49n²-9m²+45mn=49n²+3mn

(6a-3b)²+(9a+2b)² = 36a²-36ab+9b² +81a²+36ab+4b² = 117a²+11b²

b(b-3) - (b-4)² = b²-3b - b²+8b-16=5b-16

(12a-b)²-(9a-b)(16a+2b) = 144a²-24ab+b² - 144a²-18ab+16ab+2b² = -26ab+3b²

(x+5)² - (x-1)²=48

x²+10x+25 - x²+2x-1 =48

12x=24   x=2

(2x-3)²+(3-4x)(x+5) = 82

4x²-12x+9 +3x-4x²+15-20x=82

-29x=58             x= -2

(x² -3x)(4-x) =16 -x(x²-7x+12.25)

4x²-12x-x³+3x² = 16 - x³+7x²-12.25x

-12x+12.25x=16

0.25x=16           x=64