Question

$Which of the following is a quadratic equation? \\ a) \: 6 {x}^{2} = 20 - {x}^{2} - x \\ b) \: {x}^{2} (1 \div x - 2) = 7 \div 2 \\ c) \: 3 \div x - 3 = 4 {x}^{2} \\ d) \: 5x + 3x \: \\ the \: answer \: is \: (b) \: .$
Sovle and explain .

it's for 10 print's.​

Answer 1

a quadratic equation is an equation which has 2 aas the highest power