Question

Помогите сделать N2, пожалуйста

Answer 1

а)
${(x + 1)}^{2} - (x - 2)(x + 4) = {x}^{2} + 2x + 1 - ( {x}^{2} - 2x + 4x - 8) = {x}^{2} + 2x + 1 - {x}^{2} + 2x - 4x + 8 = {x}^{2} + 9$
б)
$(a + b)(a - b)( {a}^{2} + {b}^{2} ) = ( {a}^{2} - {b}^{2} )( {a}^{2} + {b}^{2} ) = {a}^{4} - {b}^{4}$

Answer 2

a)
x²+2x+1-(x²+4x-2x-8)=x²+2x+1-(x²+2x-8)=x²+2x+1-x²-2x+8=9.

б)
(a²-b²)(a²+b²)=a⁴-b⁴