Question

алегебра))))))))))))))))) ​

Answer 1

$5x^{2}-9x+4=0\\\\D=(-9)^{2} -4\cdot5\cdot4=81-80=1\\\\x_{1} =\dfrac{9+1}{10}=1\\\\x_{2} =\dfrac{9-1}{10}=0,8\\\\Otvet:\boxed{0,8}$