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  x = -2/5 or -1

Step-by-step explanation:

The last two terms of the expression on the left can be factored also.

  (5x+2)² +3(5x+2) = 0

And the common factor can be factored out:

  (5x+2)(5x +2+3) = 0

  5(5x +2)(x +1) = 0

Solutions to the equation make the factors zero:

  5x +2 = 0   ⇒   x = -2/5

  x +1 = 0   ⇒   x = -1

The values of x that are solutions to the equation are x = -2/5 and x = -1.

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Once you realize that (5x+2) is a factor, you know one solution is x = -2/5. The rest is just fluff to find the second solution. It is not required in order to answer the question.

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

1) is right

step-by-step explanation: