# Tyer

## 解答 0

• 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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