Answer:
x= -3 or x= 1.85
Step-by-step explanation:
i use X as the unknown
the number multiplied by itself 4 times is x⁴
twice is ×2 and cubed of a number is x³ which gives: 2x³
3 times the square of x is: 3x²
4 times the number is: 4x
overall we have x⁴+2x³+3x²+4x=42
NEXT STEP:
bring 42 to the left then factorise
x⁴+2x³+3x²+4x-42=0--->(x+3)(x³-x²+6x-14)
now
x+3=0--->x= -3
OR
x³-x²+6x-14=0---> x=1.85 (3sf)
not sure but from my understanding
