Question

a) (a-4)(a+5)=

b) (7b+3) (2-4b) =

c) (-3c+2d) (2c-6) =

d) (9s-2t) (7t-5) =

e) (-10m+3n) (5n-4) =

f) (3kl+8k (4-21) =

g) (4xy+3x) (2y+5x do kwadratu - y) =

h) (-2p do kwadratu q - 3p) (5pq-3p do kwadratu- q do kwadratu)=

Answer 1

a) (a-4)(a+5)=a²+5a-4a-20=a²-a-20

b) (7b+3) (2-4b) =14b-28b²+6-12b=2b-28b²+6

c) (-3c+2d) (2c-6) =-6c²+18c+4cd-12d

d) (9s-2t) (7t-5) =63st-45s-14t²+10t

e) (-10m+3n) (5n-4) =-50mn+40m+15n²-12n

f) (3kl+8k (4-21) =12kl-63kl+32k-168k=-51kl-136k

g) (4xy+3x) (2y+5x²- y) =8xy²+20x³y-4y²+6xy+15x³-3xy

h) (-2p²q - 3p) (5pq-3p²- q²)=-10p³q²+6p⁴q+2p²q³-15p²q+9p³+3pq²

Answer 2

a) (a-4)(a+5)=a2+5a-4a+20=a2+a+20

b) (7b+3) (2-4b) =14b-28b2+6-12b=-28b2+2b+6

c) (-3c+2d) (2c-6) =-6c2+18c+4dc-12d

d) (9s-2t) (7t-5) =63st-45s-14t2-10t

e) (-10m+3n) (5n-4) =50mn+40m+15n2-12n

f) (3kl+8k (4-21) =(3kl+8k)*(-17)=-51kl+(-136k)

g) (4xy+3x) (2y+5x do kwadratu - y) =(4xy+3x)(y+5x2)=4xy2+20x3y+3xy+15x3