5. A visitor to Normandy Beach looks down from a cliff to the place his grandfather landed
on the beach during D-Day. He sees a group of veterans on the beach. She notes the
angle of depression to the group is 17º. The group walks toward the base of the cliff and
stops. The angle of depression is now 39º. The cliff is 900 feet above the beach. How far
did the groups walk? You must include a labeled sketch of the problem. (8 points)

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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

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

i don’t see a picture