Let f(x)=(√x^2+x) for 1≤x≤7 . We want to estimate *Attached by the trapezium method. a) Divide the domain of f into 4 subintervals of the same length. Calculate their common length Δx(exact value). b) Determine the approximation of *Attached provided by the trapezium method with 4 sub-intervals. Give the answer to 4 decimal places.

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A: We can find the range as below.

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