Question

Find all solutions to 0= 2x^4+5x^3+38x^2+125x-300

Answer 1

`2x^4+5x^3+38x^2+125x-300=0\\\\2x^4+5x^3-12x^2+50x^2+125x-300=0\\\\x^2(2x^2+5x-12)+25(2x^2+5x-12)+0\\\\(2x^2+5x-12)(x^2+25)=0\\\Updownarrow\\1^o\ 2x^2+5x-12=0\ \vee\ 2^o\ x^2+25=0\\\\\\1^o\ \Delta=5^2-4\cdot2\cdot(-12)=25+96=121\\\\\sqrt\Delta=√(121)=11\\\\x_1=(-5-11)/(2\cdot2)=(-16)/(4)=-4;\ x_2=(-5+11)/(2\cdot2)=(6)/(4)=(3)/(2)\\\\\\2^o\ x^2=-25-false\\\\\\Answer:x=-4\ or\ x=(3)/(2)`