Question

A=2x2+3eb=x2+4
$a2 {}^{2} + 3b = {x}^{2} + 4$

Answer 1

a=2x²+3
b=x²+4

a2²+3b=x²+4

(2x²+3)4+3(x²+4)=x²+4
8x²+12+3x²+12=x²+4
8x²+3x²-x²+12+12-4=0
10x²+20=0
10x²=-20
x²=-20/10
x²=-2
x=√-2
x=√2i