Power of Maths: Paper 1 – Section 3
(e) 8x = 16 (f ) 4x = 1
__ 8
(g) 25x = 125 (h) 9x = 1
___ 27
(i) 3x + 1 = 81 ( j) 8x + 2 = 4x − 1 (k) 2x = √
__ 8
(l) 9 x − 1 = 3x + 2
6. (a) Express √ 4
( √
___ 32
__ 8
) solve
___ 32 in the form 2k. Hence, solve
__ 8
= 22x + 1.
(b) Express 27 × 3 solve (27 × 3
√
(c) Express 64 ____
√ √
___ 32
( 64 ____
___ 32
√ solve √ )
___ 81 )3x = 3x − 2.
√ 2x + 1 = 8x + 2.
(d) Express 5 × 253 ______
( 5 × 2 5 3 ______
____ 125
)
____ 125 in the form 5 p. Hence,
2 = 53x − 1.
___ 81 in the form 3k. Hence,
in the form 2k. Hence,
(m) 27 × 9 x + 1 = 3 × 3x − 2 (n) 3
__ 9x = √
__ 2 x
1
___ 27
__ 3
(o) 22x − 5 = 43x (p) 9
= 81
(q) 23x − 5 = 83x + 1 (r) (25)x + 1 = (125)2x (s) 42x = 64
___ 2x
7. An insect population P increases according to the law P = 153 × 92t − 1, where P is the number of insects in the colony t months after the population is observed. Find:
(a) the initial population, (b) when the population is 12 393.
8. Another insect population P increases according to the formula P = 17 × 33t + 1, where P is the number of insects in the sample t months after the observation begins. Find:
(a) the initial population,
(b) when the number of insects in the colony is 37 179.
9. If the two populations in questions 7 and 8 are observed beginning at the same time, when will they be equal?
10. A man’s risky investment grows according to the equation A = 8000 × 2
1
amount of investment in euro after t years. Find:
(a) the initial investment, (b) the value of the investment after 20 years,
(c) when the investment will be worth €256 000.
__ 5 t − 1, where A is the
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