Logan genetically engineered a new type of fir tree and a new type of pine tree. The combined height of one fir tree and one pine tree is
21
2121 meters. The height of
4
44 fir trees stacked on top of each other is
24
2424 meters taller than one pine tree.
How tall are the types of trees that Logan genetically engineered?

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

asdsad

step-by-step explanation:

i think the answer is b