Question

Выражение: 2) (m+4)^2-4 (m+1)^2 4)5 (3-5x)^2+3 (a-1)^2-5 (a-1)(a+1) 6)(x-1)^2-4 (x-1)^2-6 (x+1)(x-1)

Answer 1

2)

${m}^{2} + 8m + 16 - 4( {m}^{2} + 2m + 1) = {m}^{2} + 8m + 16 - 4 {m}^{2} - 8m - 4 = - 3 {m}^{2} + 12$

4)

$5(9 - 30x + 25 {x}^{2} ) + 3( {a}^{2} - 2a + 1) - 5 ({a}^{2} - 1 )= 45 - 150x + 125 {x}^{2} + 3 {a}^{2} - 6a + 3 - 5 {a}^{2} + 5 = 125 {x}^{2} - 2 {a}^{2} - 150x - 6a + 53$

6)

${x}^{2} - 2x + 1 - 4 {x}^{2} + 8x - 4 - 6 {x}^{2} + 1 = - 9 {x}^{2} + 6x - 2$