=n2+2n-n2+5n+7n-35=14n-35=7(2n-5)
Решение
x/2 + 5 > 0
3x - 1 ≥ 4x
x > - 10
4x - 3x ≤ - 1
x > - 10
x ≤ - 1
x∈ (- 10 ; - 1]
A) (4x+y)^2=16x^2+8xy+y^2
b) (4x–5rx)^2=16x^2–40rx^2+25r^2x^2
c) (–1/2y+1/5z)^2=1/4y^2 –1/5zy+1/25z^2
d) (–8d^3–7x)(8d^3–7x)= 49x^2–64d^6
e)(1,5x+5(2y^2))(–5(2y^2)+1,5x)=2,25x^2–100y^4