Question

show that x²+3x+(x²-2²)²is not a quadratic equations​

Answer 1

x²+3x+(x²-4)²

x²+3x+(x²)²+16-2*4*x²

x²+3x+x⁴+16-8x²

x⁴-7x²+3x+16

this equation's highest power i. e. degree is 4

therefore,

it is not quadratic

Answer 2

=x²+3x+(x²-2²)²

=x²+3x+(x²-4)²

=x²+3x+(x²)²-2×x²×4+(4)²

=x²+3x+x⁴-8x²+16

=x⁴-7x²+3x+16

From above calculation we get that it is not a quadratic equation because 4 is the highest degree of this equation