Question

Wykonaj mnożenie i zredukuj wyrazy podobn:

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

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

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

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

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

f)(3kl+8k)(4-2l)

Answer 1

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

b) 14b -28b2 +6-12b= -28b2 +2b +6

c) -6c2  + 18c +4cd-12d

d) 63st - 9s2 -14t2 +2st=65st-9s2 -14t2

e) -50mn+40m+15n2 -12n

f)12kl-6kl2 +24k-16kl=-6kl2 +24k-4kl

g) 8xy2 +20x3y2 +6xy+15x2 y

h) -10p3q2 +6p4q3 -15p2q + 9p3q2 = -p3q2 +6p4q3 -15p2q

 

 

Answer 2

a)(a-4)(a+5)=a^2 + 5a -4a-20= a^2 +a -20

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

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

d)(9s-2t)(7t-s)=63st - 9s^2 -14t^2 +2st=65st-9s^2 -14t^2

e)(-10m+3n)(5n-4)=-50mn+40m+15n^2 -12n

f)(3kl+8k)(4-2l)=12kl-6kl^2 +24k-16kl=-6kl^2 +24k-4kl

g)(4xy+3x)(2y+5x^2y)=8xy^2 +20x^3y^2 +6xy+15x^2y

h)(-2p^2q-3p)(5pq-2p^2q^2)=-10p^3q^2 +6p^4q^3 -15p^2q + 9p^3q^2 = -p^3q^2 +6p^4q^3 -15p^2q