Question

efetue as multiplicações:
a)3y(4×2-2×3-7)
b)(x4-3x2-5x+1) (-4x)
c)2x(y2+xy+1)
d)4ab(a2+b2-ab)
e) 4x y2 (4x+y+1)​

Answer 1

a)3y(4×2-2×3-7)

3y(8-6-7)

3y(2-7)

3y . (-5)

= -15y

b)(x⁴-3x²-5x+1) . (-4x)

= -4x(x⁴-3x²-5x+1)

c)2x(y²+xy+1)

2xy²+2xxy+2x

= 2xy²+2x²y+2

d)4ab(a²+b²-ab)

4aa²b+4abb²+4ab . (-ab)

4a³b+4ab¹+2+4ab . (-ab)

= 4a³b+4ab³ - 4a²b²

e) 4xy² (4x+y+1)

(4×4)xxy²+4xy²y+4xy²

16x²y²+4xy²+¹+4xy²

= 16x²y²+4xy³+4xy²