Question

2*x+4×7*x+4>2*3x×7*3x

Answer 1

2x+4•7x+4>2•3x•7•3x

2x+28x+4>6x•21x

30x+4>126x^2

-126x^2+30x+4=0

D=b-4ac=30-4•(-126•4)=2045

x1,2=

$frac{ - b + - sqrt{d} }{2a}$

x1=-2/21

x2=1/3