Subtract -7a^2+3a-9−7a 2+3a−9minus, 7, a, squared, plus, 3, a, minus, 9 from 5a^2-6a-45a 2 −6a−4

Step-by-step explanation:

We need to subtract

from

So

Opeining the bracket changes the signs

Bringing all the like terms together

The result after performing the required operation is .

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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,