Помогите решить два задания плиз

345.
1.
$(3 {m}^{2} - p)( {m}^{2} + p) = \\ = 3 {m}^{4} - {p}^{2}$
2.
$( {5a}^{2} + b)( {b}^{2} - {4a}^{2}) = \\ = {b}^{3} - {20a}^{4}$
3.
$( {12a}^{2} - 3)(5a - {7a}^{2} ) = \\ = {60a}^{3} - {84a}^{4} - 15a + {21a}^{2}$
4.
$( {2a}^{3} - {3a}^{2} )(a + 5) = \\ = {2a}^{4} + {7a}^{3} - {15a}^{2}$
347
1.
$(a + b)(m - 2 + p) = \\ = am + bm - 2a - 2b + ap + bp$
2.
$(5 - x)(m - n - p) = \\ = 5m - xm - 5n + xn + xp - 5p$
3.
$(x + y - 2)(a - m) = \\ = xa + ya - 2a - xm - ym + 2m$
4.
$(p + q + 3)( -a - x) = \\ = - ap - px - aq - qx - 3a - 3x$