Solve the equation x\(^2\) - 2x - 3 = 0
(-3, 1)
(-1, -3)
(3,1)
(43, 0)
(-1, 3).
Correct answer is E
x\(^2\) - 2x - 3 = 0
x\(^2\) - 3x + x - 3 = 0
x(x - 3) + 1(x - 3) = 0
(x + 1)(x - 3) = 0
x = (-1, 3)
Factorize the expression 2s\(^2\) - 3st - 2t\(^2\).
(2s - t)(s + 2t)
(2s + t)(s - 2t)
(s + t)(2s - 1)
(2s + t)(s -t)
(2s + t)(s + 2t)
Correct answer is B
2s\(^2\) - 3st - 2t\(^2\)
= 2s\(^2\) - 4st + st - 2t\(^2\)
= 2s(s - 2t) + t(s - 2t)
= (2s + t)(s - 2t)
Which of the following parts of the tongue does not correspond to the taste indicated beside it?
Tip/sweet
Centre/salty
Back/sour
Side/sour
Back/bitter
Correct answer is C
No explanation has been provided for this answer.
Thunder is usually heard some seconds after lightning is observed because
the human eye is more sensitive to light than the ear to sound
sound and light travel in different media
thunder occurs after lightning
light travels faster than sound
Correct answer is D
No explanation has been provided for this answer.
Simplify: \(\frac{\log \sqrt{27}}{\log {81}}\)
1/6
3/8
1/2
3/4
6
Correct answer is B
\(\frac{\log \sqrt{27}}{\log 81}\)
= \(\frac{\log \sqrt{3^3}}{\log 3^4}\)
= \(\frac{\log 3^{\frac{3}{2}}}{\log 3^4}\)
= \(\frac{\frac{3}{2} \log 3}{4 \log 3}\)
= \(\frac{\frac{3}{2}}{4}\)
= \(\frac{3}{8}\)