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Tyer

Maths MC thanksss

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  • 解數雜貨店
    2020-09-22 09:00:27
    1) The square of a number is non-negative. So, the minumum value must be zero Min of g(x) is 5(0) at x-7 = 0
  • 解數雜貨店
    2020-09-22 09:01:48
    2) Use the identity sin²θ+cos²θ = 1. Plug in cos θ = √15/11
  • 解數雜貨店
    2020-09-22 09:04:28
    3) Both f(x) and g(x) can accept any value of x as input. But note that x² is non-negative so g(x) won’t be negative
  • 解數雜貨店
    2020-09-22 09:07:32
    4) You can not take square root of a negative number. The denominator of a fraction can not be zero. So, do you think f(x) and g(x) will have the same domain?
  • 解數雜貨店
    2020-09-22 09:10:55
    5) 274-360n (n=1,2,...)
  • Tyer
    2020-09-22 11:55:59
    May I know the answer of the questions? I have think about it but still cant get the answer
    •  解數雜貨店 2020-09-22 09:07:32
    • 4) You can not take square root of a negative number. The denominator of a fraction can not be zero. So, do you think f(x) and g(x) will have the same ..
  • Tyer
    2020-09-22 11:57:39
    They don't have same range, but do they have same domain?
    •  解數雜貨店 2020-09-22 09:04:28
    • 3) Both f(x) and g(x) can accept any value of x as input. But note that x² is non-negative so g(x) won’t be negative
  • 解數雜貨店
    2020-09-22 13:36:16
    4) The domain of f(x) is (c) and the domain of g(x) is (a). So apparently, they are not the same. We should choose (d)
  • 解數雜貨店
    2020-09-22 13:37:47
    3) They have the same domain. I said both of them can accept any value of x as input
  • 解數雜貨店
    2020-09-22 13:40:16
    6) -5t+7 = 5t²+7 Solve for t and count the number of solutions
  • 解數雜貨店
    2020-09-22 13:42:18
    7) f(x) reaches the min/max when (x-h)² goes to zero
  • 解數雜貨店
    2020-09-22 13:45:22
    8) Quadractic eqaution always has two roots. There is no need to check. So, we can forget about (b) and (d) and look at the remaining two choices carefully
  • 解數雜貨店
    2020-09-22 13:49:32
    9) Either the numerator or the denominator is a negative number, not both. Which quadrant has -ve x-coordinate and +ve y-coordinate? Which quadrant has +ve x-coordinate and -ve y-coordinate?
  • 解數雜貨店
    2020-09-22 13:58:11
    10) -210° is equivalent to -210°+360° = 150°. You can now apply the regular formula to find the acute reference angle.
  • 解數雜貨店
    2020-09-22 19:42:43
    11) The parent function is 1/x From 1/x to 2/x, it undergoes a vertical strench. From 2/x to 2/(x-1), it undergoes a horizontal translation to the right From 2/(x-1) to 2/(x-1), it undergoes a vertical translation upward
  • 解數雜貨店
    2020-09-22 19:43:46
    12) sec θ = 1/cos θ
  • 解數雜貨店
    2020-09-22 20:02:07
    13) -1 ≤ sin θ ≤ 1. Replace the sine function by 1 and -1 to find the min/max The sine value repeats itself every 360°. The period is the value of x such that 4x = 360 The phase shift is -80°
  • 解數雜貨店
    2020-09-22 20:05:14
    14 (a) affects the vertical variation (b) affects the horizontal variation (c) affects the vertical variation
  • 解數雜貨店
    2020-09-22 20:07:58
    15) The period of cosine is always the same. The larger the multiplier, the smaller value of x is needed to complete one period
  • 解數雜貨店
    2020-09-22 20:11:11
    16) Phase shift is the angle offset inside the trigo function
  • 解數雜貨店
    2020-09-22 20:15:40
    17) Just evaluate t₁ and t₂ for each option and compare them to the given sequence. Once you found the right answer, check t₃ and t₄ for safety.
  • 解數雜貨店
    2020-09-22 20:17:16
    18) Find x in terms of f(x) and that is f⁻¹(x)
  • 解數雜貨店
    2020-09-22 20:20:34
    19 Observe the pattern this way 1st term: 5 = 2+3×1 2nd term: 8 = 2+3x2 3rd term: 11 = 2+3×3 ... n-th term: 2+3n
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