Hello here is a solution :
Evaluate f(2) for the function f(x) = 3x2 + 2x - 5
2 answers:
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<u>B) </u>
<u>C) </u> volume = .
<u>Step-by-step explanation:</u>
Here we have , The base of an open rectangular box is of length (2x+5) cm and width x cm. The area of this base is 58cm^2. The height of the open box is (x-2) cm. We need to find the following :
a) show that 2x^2+5x-58=0
We know that area of rectangle =
⇒
Putting values according to question we get :
⇒
⇒
⇒
b) solve the equation in the question above, giving your answer to 2 decimal places
Solving this equation :
⇒
By quadratic formula
⇒
⇒
⇒
⇒ { Since side can't be negative ! }
⇒
c) calculate the volume of the box, stating units of you answer
Since x = 4.28 , other sides are
We know that volume is given by :
⇒
⇒
⇒
Therefore , volume = .