Question

dau coroana + inimioara​

Answer 1

a) 3x(x+1)² - (2x-3)(2x+3)² + x²(5x+6) = 3x(x²+2x+1) - (2x-3)(4x²+12x+9) + 5x³+6x² = 3x³+6x²+3x - (8x³+24x²+18x - 12x²- 36x - 27) + 5x³ + 6x² = 8x³+12x²+3x - 8x³ - 24x²-18x+12x²+36x+27 = 21x+27

b) -2x(x²-x+1) - 2x(x+1) + (x+1)² + 2x(x²+1) = -2x(x²-x+1 + x+1) + x²+2x+1 + 2x³ + 2x = -2x(x²+2) + 2x³ + 4x + x²+1 = -2x³-4x + 2x³ + x² + 4x+1 = x² + 1

c) 11x(2x-3) - (25x²):(-5x) + (2x+y)²- 4x(x+y) - 2x(11x-14) = 22x²-33x + 5x + 4x²+4xy+y² - 4x² - 4xy - 22x² + 28x = y²