Question

решите неравенство 7-3х-4х^>0

Answer 1

7-3х-4х²>0
4x²+3x-7<0
D=9+4*4*7=121
x₁=(-3-11)/8=-1.75
x₂=(-3+11)/8=1
4(x+1.75)(x-1)<0
x∈(-1.75; 1)