-6x² (x+5)* -(x-3)* +(x² -2)(2x² +1)-4x² (3x-4)²

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8) -6x² (x+5)* -(x-3)* +(x² -2)(2x² +1)-4x² (3x-4)²
9) (5x-3y) -(4x+y)(4x-y)-(3x+5y)² + (x-3y) (x+y)
10) (-4x+2y) (-4x-2y) + (x - 5y)²-(3x+2y)² -7x(x-3y)
11) 3x(x - 5)(x + 2) + 2(x-1)³ - (2x + 1)(4x² - 2x + 1)
12) -5x(x - 3)(x + 3) + (x + 1)(x-2) + (x - 1)(x²+x+1)
13) (x-4)³2x(x - 5)2 + (x-4)(x² + 4x + 16)-(x-3)³
14) (x + 5Xx® = 5x + 25) – (x + 3) + ( - 2)(x + 2x + 4) - (x - 1)
15) (x-7)(x² + x) - (x + 2)(x-7)(x² + 7x +49) + (x + 1)³
16) (x - 5)(x-2)(x+1)+(x-3)(x² + 3x + 9) - (x + 2)²
17) (2x - 3)(4x + 6x +9)- (2x - 1)³+ (3x + 1)(9x² - 3x + 1)
18) (2x + 1) (5x + 2)(25x² - 10x + 4) + (x5)-(5 + 3x)³
19) (3x-2y)³ - (4x - 5y)(16x² + 20xy + 25y³) + (y + 2x)
20) (x + 3y)³+ (3x + 2yX9x² - 6xy + 4y³)-(2y - 3x)³
21) (5x - y)25x² + 5xy + y) - (x-2y)³ - 3(2x + y)²
22) -4(x+3y) + (x-3y) (x+y)(x-y)-(2x - y)³
23) (3x + y)²-(5x-y) (25x² + 5xy + y²)+(x+2y)³