What are the solutions of the equation (x + 2)2 – 2(x + 2) – 15 = 0? Use u substitution to solve.

Mathematics

1 answer:

Scrat [10]2 years ago

6 0

Answer:

Step-by-step explanation:

hello :

(x + 2)2 – 2(x + 2) – 15 = 0

let : t= x+2

t²-2t-15 =0

(t-5)(t+3)=0

t-5=0 or t+3=0

t=5 or t=-3

but : t =x+2

if : t=5 x+2 =5 so : x=3

if : t= -3 x+2 = -3 so : x= -5

conclusion two solutions : 3 , -5

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6 0

3 years ago

Read 2 more answers

Robbie was given $80 to spend at the Fair. His admission to the park costs $15.50 and each ride cost $5. He anticipates the cost

Ad libitum [116K]

Answer:

7 or 8

Step-by-step explanation:

Robbie was given $80.

His admission costs $15.50

80 - 15.50 = $64.50

He anticipates the cost of food at the fair will be $25.