(1) Write the quadratic equation, if a + B = 9 and aß = 20.
(ii) For drawing the graph of 2x + y = - 4, if x = - 3, what is the value of y?
(iii) If the rate of GST on paints is 28%, what is the rate of CGST and SGST?
(iv) If Ex;f; = 575 and Ef;= 25, find the mean X.
Answers
Answered by
4
1. x^2-(sum of zeroes)x+product of zeroes
x^2-9x+20
2. if x=-3
y=-2
4.mean is sigma fixi divided by sigma fi
hence mean is 575/25
=23
sorry but I don't know 3rd one.
Answered by
0
Answer:
x2-9x+20=0 by the quadratic formula given in Ch 2 polynomials
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