What are the factors of

f. (4c + 3d)(30 - 2d)
g. (40 - 3d)(3c + 2d)
h. (6c + d)(20 – 6d)
j. 6(2c – d)( c + d)
k. 6(2c + d)( c - d)

For this case we have the following expression:

Rewriting the expression we have:

Grouping:

We draw common factor from each group:

idk

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15