Getal & Ruimte (12e editie) - havo wiskunde B

'Logaritmen herleiden'.

havo wiskunde B 9.3 Rekenregels voor logaritmen

Logaritmen herleiden (6)

opgave 1

Herleid tot één logaritme.

1p

a

\({}^{3}\!\log(2) + {}^{3}\!\log(p + 5)\)

Optellen (1)
00ku - Logaritmen herleiden - basis - basis - 0ms - dynamic variables

a

\({}^{3}\!\log(2) + {}^{3}\!\log(p + 5)\)
\(\text{ } = {}^{3}\!\log(2 ⋅ (p + 5))\)
\(\text{ } = {}^{3}\!\log(2 p + 10)\)

1p

1p

b

\({}^{4}\!\log(5 x) - {}^{4}\!\log(2 x - 1)\)

Aftrekken
00kv - Logaritmen herleiden - basis - eind - 1ms - dynamic variables

b

\({}^{4}\!\log(5 x) - {}^{4}\!\log(2 x - 1)\)
\(\text{ } = {}^{4}\!\log({5 x \over 2 x - 1})\)

1p

2p

c

\(2 ⋅ {}^{3}\!\log(5 a)\)

Vermenigvuldigen
00kw - Logaritmen herleiden - basis - midden - 0ms - dynamic variables

c

\(2 ⋅ {}^{3}\!\log(5 a)\)
\(\text{ } = {}^{3}\!\log((5 a)^{2})\)

1p

○

\(\text{ } = {}^{3}\!\log(25 a^{2})\)

1p

2p

d

\(5 ⋅ {}^{2}\!\log(a) + {}^{2}\!\log(3 a - 1)\)

OptellenVermenigvuldigen
00kx - Logaritmen herleiden - basis - eind - 0ms - dynamic variables

d

\(5 ⋅ {}^{2}\!\log(a) + {}^{2}\!\log(3 a - 1)\)
\(\text{ } = {}^{2}\!\log(a^{5}) + {}^{2}\!\log(3 a - 1)\)

1p

○

\(\text{ } = {}^{2}\!\log(a^{5} ⋅ (3 a - 1))\)
\(\text{ } = {}^{2}\!\log(3 a^{6} - a^{5})\)

1p

opgave 2

Herleid tot één logaritme.

2p

a

\(4 + {}^{2}\!\log(3 x - 5)\)

Grondtal (1)
00ky - Logaritmen herleiden - basis - midden - 0ms - dynamic variables

a

\(4 + {}^{2}\!\log(3 x - 5)\)
\(\text{ } = {}^{2}\!\log(2^{4}) + {}^{2}\!\log(3 x - 5)\)
\(\text{ } = {}^{2}\!\log(16) + {}^{2}\!\log(3 x - 5)\)

1p

○

\(\text{ } = {}^{2}\!\log(16 ⋅ (3 x - 5))\)
\(\text{ } = {}^{2}\!\log(48 x - 80)\)

1p

3p

b

\({}^{4}\!\log(64) + {}^{2}\!\log(5 a - 1)\)

Grondtal (2)
00kz - Logaritmen herleiden - basis - eind - 0ms - dynamic variables

b

\({}^{4}\!\log(64) + {}^{2}\!\log(5 a - 1)\)
\(\text{ } = {}^{4}\!\log(4^{3}) + {}^{2}\!\log(5 a - 1)\)
\(\text{ } = 3 + {}^{2}\!\log(5 a - 1)\)

1p

○

\(\text{ } = {}^{2}\!\log(2^{3}) + {}^{2}\!\log(5 a - 1)\)
\(\text{ } = {}^{2}\!\log(8) + {}^{2}\!\log(5 a - 1)\)

1p

○

\(\text{ } = {}^{2}\!\log(8 ⋅ (5 a - 1))\)
\(\text{ } = {}^{2}\!\log(40 a - 8)\)

1p

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