Question

solve the question given​

Answer 1

Step-by-step explanation:

$x = \ \frac{ \sqrt{5} + \sqrt{3} }{4 \sqrt{5} + 4 \sqrt{3} - 3 \sqrt{5} - 3 \sqrt{3} } \\ x = \frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} (4 - 3) + \sqrt{3}(4 - 3) }$

$x = \frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} + \sqrt{3 } } \\ x = 1$

then 4x²+3x+5= 4(1)+3(1)+5 = 12