Question

expand:
a. 3m(7-3n)
b.(2x+3) (4x-4)
c.(3x+5)²​

Answer 1

Part a)

$\sf{}3m(7 - 3n)$

$= \sf{}21m - 9mn$

Part b)

$\sf{}(2x+3) (4x-4)$

$= \sf{}8 {x}^{2} - 8x + 12x - 12$

$= \sf{}8 {x}^{2} + 4x - 12$

Part c)

$\sf(3x+5 {)}^{2}$

$= \sf9 {x }^{2} + 25 + 2(3x \times 5)$

$= \sf9 {x }^{2} + 25 + 30x$

¡saludos!