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Commerce (English Medium) Class 12 - CBSE Question Bank Solutions

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If f : R → R, g : R → R and h : R → R are such that f(x) = x2, g(x) = tan x and h(x) = log x, then the value of (go(foh)) (x), if x = 1 will be ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

If f(x) = `(3"x" + 2)/(5"x" - 3)` then (fof)(x) is ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

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Let f : R → R be the functions defined by f(x) = x3 + 5. Then f-1(x) is ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

Let f : R – `{3/5}`→ R be defined by f(x) = `(3"x" + 2)/(5"x" - 3)` Then ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

If f(x) = (ax2 – b)3, then the function g such that f{g(x)} = g{f(x)} is given by ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

Which one of the following functions is not invertible?

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

The inverse of the function `"y" = (10^"x" - 10^-"x")/(10^"x" + 10^-"x")` is ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

If f : R → R defind by f(x) = `(2"x" - 7)/4` is an invertible function, then find f-1.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

Consider the function f in `"A = R" - {2/3}` defiend as `"f"("x") = (4"x" + 3)/(6"x" - 4)` Find f-1.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

If f is an invertible function defined as f(x) `= (3"x" - 4)/5,` then f-1(x) is ____________.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

If f : R → R defined by f(x) `= (3"x" + 5)/2` is an invertible function, then find f-1.

[1] Relations and Functions
Chapter: [1] Relations and Functions
Concept: undefined >> undefined

Using determinants, find the equation of the line joining the points (1, 2) and (3, 6).

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

If ` abs((1 + "a"^2 "x", (1 + "b"^2)"x", (1 + "c"^2)"x"),((1 + "a"^2) "x", 1 + "b"^2 "x", (1 + "c"^2) "x"), ((1 + "a"^2) "x", (1 + "b"^2) "x", 1 + "c"^2 "x"))`, then f(x) is apolynomial of degree ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

`abs (("a"^2, 2"ab", "b"^2),("b"^2, "a"^2, 2"ab"),(2"ab", "b"^2, "a"^2))` is equal to ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

If `alpha, beta, gamma` are in A.P., then `abs (("x" - 3, "x" - 4, "x" - alpha),("x" - 2, "x" - 3, "x" - beta),("x" - 1, "x" - 2, "x" - gamma)) =` ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

`abs ((1, "a"^2 + "bc", "a"^3),(1, "b"^2 + "ca", "b"^3),(1, "c"^2 + "ab", "c"^3))`

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

Solve the following system of equations x − y + z = 4, x − 2y + 2z = 9 and 2x + y + 3z = 1.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

If the system of equations x + ky - z = 0, 3x - ky - z = 0 & x - 3y + z = 0 has non-zero solution, then k is equal to ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

If the system of equations 2x + 3y + 5 = 0, x + ky + 5 = 0, kx - 12y - 14 = 0 has non-trivial solution, then the value of k is ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined

`abs ((("b" + "c"^2), "a"^2, "bc"),(("c" + "a"^2), "b"^2, "ca"),(("a" + "b"^2), "c"^2, "ab")) =` ____________.

[4] Determinants
Chapter: [4] Determinants
Concept: undefined >> undefined
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