Construct and equilateral triangle AB=40mm, using the direct method-ratio 5:3

$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

a. positive: 2 or 0; negative : 2 or 0; complex: 4or2or0