The colour that is associated with a positive iodine test is
brown
red
blue-black
yellow
Correct answer is C
No explanation has been provided for this answer.
which of the following is not quadratic expression?
\(y = 2x^2 - 5x\)
\(y=x(x-5)\)
\(y = x^2 - 5\)
y = 5(x-1)
Correct answer is D
A quadratic equation is an equation of the second order. The highest power in the equation is 2.
If \(2x^2 + kx - 14 = (x+2)(2x-7)\), find the value of K
-3
5
9
11
Correct answer is A
\(2x^2 + kx - 14 = (x+2)(2x-7)\\
∴2x^2 + kx - 14 = 2x^2 - 3x - 14\)
equating coefficient K = -3
if \(\frac{4m+3n}{4m-3n}=\frac{5}{2}\), find the ratio m:n
7:4
4:3
3:4
4:7
Correct answer is A
\(\frac{4m + 3n}{4m - 3n} = \frac{5}{2}\)
\(5(4m - 3n) = 2(4m + 3n)\)
\(20m - 15n = 8m + 6n\)
\(20m - 8m = 6n + 15n\)
\(12m = 21n\)
\(\frac{21}{12} = \frac{m}{n}\)
\(m : n = 7 : 4\)
If \(\frac{y-3}{2}<\frac{2y-1}{3}\), which of the following is true?
y > 7
y < -7
y > -7
y < 7
Correct answer is C
\(\frac{y - 3}{2} < \frac{2y - 1}{3}\)
\(3(y - 3) < 2(2y - 1)\)
\(3y - 9 < 4y - 2\)
\(3y - 4y < -2 + 9\)
\(-y < 7\)
\(y > -7\)