(-10/7) + 1/6 , once you find the lcd, do you add or subtract?

Since both fractions have the same denominator, you can simply add up (or substract) the numerators and keep the denominator unchanged :

x2+3x+2x2−16+3x+6x2−16=(x2+3x+2)+(3x+6)x2−16

=x2+6x+8x2−16.

Then, you can factorize it :

x2+6x+8x2−16=(x+2)(x+4)(x+4)(x−4)=x+2x−4.

In the case of a substraction :

x2+3x+2x2−16−3x+6x2−16=(x2+3x+2)−(3x+6)x2−16

=x2−4x2−16=(x+2)(x−2)(x+4)(x−4).

step-by-step explanation:

in the absence of parentheses, i will have to make some assumptions:   i interpret your (3x+5/y^6)(4y^3/5)​ to mean:

3x + 5     4y^(3/5)       (3x + 5)(4)

* =

    y^6             1               y^(6-3/5)

if this is not what you expected, repost your question using parentheses to indicate whether you meant

4y^3

    or   4y^(3/5)

    5

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol