Question

a) 7x * (x + 5) b) x2 * (x – 7) c) 11x2 * (2x + 1) d) 6x * (x2 + 3) e) 5x2 * (x2 – 2x) f) 4x3 * (2x2 + 10)

Answer 1

Oie, Td, Bom?!

a)

$7x \: . \: (x + 5) \\ 7x \: . \: x + 7x \: . \: 5 \\ 7x {}^{2} + 35x$

b)

$x {}^{2} \: . \: (x - 7) \\ x {}^{2} \: . \: x - 7x {}^{2} \\ x {}^{3} - 7x {}^{2}$

c)

$11x {}^{2} \: . \: (2x + 1) \\ 11x {}^{2} \: . \: 2x + 11x {}^{2} \\ 22x {}^{3} + 11x {}^{2}$

d)

$6x \: . \: (x {}^{2} + 3) \\ 6x \: . \: x {}^{2} + 6x \: . \: 3 \\ 6x {}^{3} + 18x$

e)

$5x {}^{2} \: . \: (x {}^{2} - 2x) \\ 5x {}^{2} \: . \: x {}^{2} - 5x {}^{2} \: . \: 2x \\ 5x {}^{4} - 10x {}^{3}$

f)

$4x {}^{3} \: . \: (2x {}^{2} + 10) \\ 4x {}^{3} \: . \: 2x {}^{2} + 4x {}^{3} \: . \: 10 \\ 8x {}^{5} + 40x {}^{3}$

Att. Makaveli1996