Question

check whether (x +3)³ = x³ - 8 is a quadratic equation ?

Answer 1

$(x + 3) {}^{3} = x {}^{3} - 8 \\ {x}^{3} + 27 = {x}^{3} - 8 \\ = {x}^{3} + 27 - {x}^{3} + 8 \\ = 35$