See the NECO Math Questions, Some Teachers Couldn't Solve

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.

Log(x² + 4) = 2 + log^x - log²⁰
log(x² + 4) = log¹⁰⁰ + log^x - 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