Exercise · ZW-RIEMANN-INTEGRAL-003 · ★☆☆ Basic
Compute \(\displaystyle\int_1^4 5\,dx\).
Choose one option.
Show answer
- B. \(15\)
Explanation
For a constant \(c\), every sum equals \(c(b-a)=5\cdot3=15\).
Review the concept: Riemann integral
A bounded function \(f\) on \([a,b]\) is integrable if the supremum \(L(f)\) of its lower sums and the infimum \(U(f)\) of its upper sums, over partitions \(P\), coincide; that common value is its integral.
\[L(f)=\sup_P L(f,P)=\inf_P U(f,P)=U(f)=\int_a^b f(x)\,dx\]
More practice problems: riemann integral
- ZW-RIEMANN-INTEGRAL-001 Compute ∫_0^1 x dx.
- ZW-RIEMANN-INTEGRAL-002 Compute ∫_0^2 x^2 dx.
- ZW-RIEMANN-INTEGRAL-004 Compute ∫_0^πsin x dx.
- ZW-RIEMANN-INTEGRAL-005 Let f=1 on the rationals and f=0 on the irrationals, over [0,1]. Is it Riemann integrable?
- ZW-RIEMANN-INTEGRAL-006 Which of these functions on [0,1] is not Riemann integrable?
- ZW-RIEMANN-INTEGRAL-007 Let f(x)=0 if x<tfrac12 and f(x)=1 if x≥tfrac12, on [0,1]. Compute ∫_0^1 f.
- ZW-RIEMANN-INTEGRAL-008 Compute ∫_-1^1 x^3 dx.
- ZW-RIEMANN-INTEGRAL-009 A bounded function f on [a,b] is integrable if and only if…