Hi..can anyone help me.. I really just want to know how can you do it.. I want to learn because I have more examples.. can anyone please help me...

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

its 50 miles away from the starting point