Question

pls give the full explanation...​

Answer 1

Answer:

please tell this question is from which class

Answer 2

Step-by-step explanation:

1) (x-2y+3) ×(x+2y)

x(x+2y)-2y(x+2y) +3(x+2y)

$x {}^{2} - 4y {}^{2} + 3x + 6y$

b)

$(3x {}^{2} - 2x - 1) \times(2x {}^{2} + x - 5)$

$3x {}^{2} (2x {}^{2} + x - 5) - 2x(2x {}^{2} + x - 5)$

$6x { {}^{2} }^{2} + 3x {}^{2} x - 15x {}^{2} - 4x {}^{2} x - 2x {}^{2} + 10x - 2x {}^{2} - x + 5$

$6x { {}^{2} }^{2} - x {}^{2} x - 19x {}^{2} \times + 9x + 5$