Question

exercițiul 13 va rog dau coroana!!!!!!va rog

Answer 1

a) E(1) + E(2) + E(3) = (4x²-3x+3)+(7x²+6x-5)+(9x²-5x+2)

= 4x²+7x²+9x²-3x+6x-5x+3-5+2

= 20x²-2x

b) E(1) - E(2) - E(3) = (4x²-3x+3)-(7x²+6x-5)-(9x²-5x+2)

= 4x²-3x+3-7x²-6x+5-9x²+5x-2

= 4x²-7x²-9x²-3x-6x+5x+3+5-2

= -12x²-4x+6

c) E(1) + E(2) - E(3) = (4x²-3x+3)+(7x²+6x-5)-(9x²-5x+2)

= 4x²-3x+3+7x²+6x-5-9x²+5x-2

= 4x²+7x²-9x²-3x+6x+5x+3-5-2

= 2x²+8x-4

d) E(1) - (E(2) + E(3)) = (4x²-3x+3) - (7x²+6x-5+9x²-5x+2)

= 4x²-3x+3 - (16x²+x-3)

= 4x²-3x+3-16x²-x+3

= -12x²-4x+6