Question

Zadanie 13 zapisz w jak najprostszej postaci b)(5k+n)(k-2n)-k(4k+n)=

c)(4y+3)(y-2)-2y(4-2y)

d)-(3c-2)(c-1)-c(c-2)

e)2(3a^2-1)-(a+2)(a+2)

f)5x^2(x62+1)-(x^2-2)(x^2+3)

prosze o pomoc dam naj

Answer 1

b)(5k+n)(k-2n)-k(4k+n)=5k²-10kn+kn-2n²-4k²-kn=1k²-10kn-2n²

c)(4y+3)(y-2)-2y(4-2y)=4y²-8y+3y-6-8y+4y²=-13y+8y²-6

d)-(3c-2)(c-1)-c(c-2)=(-3c+2)(c-1)-c²+2c=-3c²+3c+2c-2-c²+2c=-4c²+7c-2

e)2(3a²-1)-(a+2)(a+2)=6a²-2-a²-2a-2a-4=5a²-4a-4

f)5x²(6x²+1)-(x²-2)(x²+3)=3x⁴+5x²-x⁴-3x²+2x²+6=2x⁴+4x²+6