See the NECO Math Questions, Some Teachers Couldn't Solve
Page 1 of 1 • Share
- DeswimmerAdministrator
- Gender : Male
Time Online : 50d 3h 17m 1s
State : Enugu
My Club :
Posts : 533 Posts Liked : 140
Awards :
See The Recent NECO Math Questions Some School Teachers Couldn't Solve
Same order they appeared in d question paper.
Q3) A man is 5 times older than his son. Four yrs ago, d product of their ages was 448. Find their present ages.
Q7a) Find d value of n if
32n+1 - 4(3n+1) + 9 = 0
7b) Solve d eqn:
log(x2+4) = 2 + logx - log20
Q9a) A two-digit number is such that its tens digit is greater than its unit digit by 5. If d number is 14 less than 3 times d product of its digits, find d number.
Let's see how many Nairalanders can give it a shot. Anyone who answers correctly will get a reward.
Same order they appeared in d question paper.
Q3) A man is 5 times older than his son. Four yrs ago, d product of their ages was 448. Find their present ages.
Q7a) Find d value of n if
32n+1 - 4(3n+1) + 9 = 0
7b) Solve d eqn:
log(x2+4) = 2 + logx - log20
Q9a) A two-digit number is such that its tens digit is greater than its unit digit by 5. If d number is 14 less than 3 times d product of its digits, find d number.
Let's see how many Nairalanders can give it a shot. Anyone who answers correctly will get a reward.
- ParadiseAdministrator
- Gender : Male
Time Online : 8d 3h 36m 31s
State : Ebonyi
My Club :
Posts : 1080 Posts Liked : 381
Awards :
Log(x2 + 4) = 2 + logx - log20
log(x2 + 4) = log100 + logx - log20
log(x2 + 4) = log (100 X x)
20
Now, you cross multiply
given you 20(x2 + 4) = 100 X x
20x2 + 80 = 100x
now divid by 20
20x2/ - 100x + 80 = 0
20 20 20
x2 - 5x + 4 = 0
x2 - 4x - x + 4 = 0
(x2 - 4x)(x + 4)
x(x - 4) -1(x - 4)
(x - 1)(x - 4)
x = 1 or 4
log(x2 + 4) = log100 + logx - log20
log(x2 + 4) = log (100 X x)
20
Now, you cross multiply
given you 20(x2 + 4) = 100 X x
20x2 + 80 = 100x
now divid by 20
x2 - 5x + 4 = 0
x2 - 4x - x + 4 = 0
(x2 - 4x)(x + 4)
x(x - 4) -1(x - 4)
(x - 1)(x - 4)
x = 1 or 4
Similar topics
Create an account or log in to leave a reply
You need to be a member in order to leave a reply.
Page 1 of 1
Permissions in this forum:
You can reply to topics in this forum