2y − 8 = −3x − 3
3x + 2y − 5 = 0 A = 3 B = 2 C = −5
(x1, y1) = (0, 4) (x2, y2) = (3, 0)
m = y2−y1
x2−x1 = (0)−(4)
(3)−(0) =−4
3
Trang 12·
10mi 0.25hrs =
miles hour
y = mx m = 33.81ounces 1liter
y = m · x
y = 33.811 · x
x = 12
Trang 131◦ C
K = C + b
Trang 14− tan θ2
=− cot θ2.
m1m2 =− cot θ2· tan θ2 =−1
Trang 175
6π
= − √32
tanπ3
Trang 19cos2θ =
1
Trang 20sin θ cos θ = tan θ,
cos θ sin θ = cot θ,
Trang 22(24· 2 −3/2)2
(28/2 · 2 −3/2)2
(28/2−3/2)2(25/2)2 = 25 = 32
1
(271) = 27
Trang 25− ln1 3
= ln 13−1
= ln 3log4(x2− 4) = log4[(x − 2)(x + 2)] = log4(x − 2) + log4(x + 2)
log24(3x−1) = (3x − 1) log2(22) = (3x − 1)(2 · log22) = (3x − 1)(2 · 1) = 6x − 2
− ln1 5
= ln 15−1
= ln 5ln
x2−y2
√ x
Trang 33(−4)2− 4(3)(7) = 16 − 12(7) = 16 − 84 = −68 < 0
2+√ 17i
Trang 347− √41 2
z · w = (a + bi)(c + di) = (ac − bd) + (ad + bc)i
= (ac − bd) − (ad + bc)i