Question

Help me pls i dont understand it

Answer 1

Explanation:

x×4=2x²(x-1)

2x³-2x²-4x=0

2x(x²-x-2)=0

x≠0

x²-x-2=0

x²-2x+x-2=0

x(x-2)+1(x-2)=0

(x-2)(x+1)=0

x=2

or

x=-1 (rejected)

Answer 2

Explanation:

Formula

The following relationship exists between the parts of each chord.

(x - 1)(2x^2) = 4*x

Solution

The easiest way to start is to divide both sides of the equation by x.

(x - 1)(2x^2)/x = 4x / x Divide by x

( x-1)(2x) = 4 Remove the brackets

2x^2 - 2x = 4 Subtract 4 from both sides

2x^2 - 2x - 4 = 4 - 4 Combine

2x^2 - 2x - 4 = 0 Pull out the common factor

2(x^2 - x - 2) = 0 Divide by 2

x^2 - x - 2 = 0 Factor

(x - 2)(x + 1)

Answer:

x can be 2 or x can be - 1 on paper. The x on the upper right prohibits that. A line can't have a length of - 1. So - 1 is called an extraneous solution.

The answer is x = 2