Question
I. x2 – 10x + 21 = 0 II.
y2 + 11y + 28 = 0 In each of the following questions, there are two equations. You have to solve both equations and mark the correct answer.Solution
I. x2 – 10x + 21 =0 => x2 - 7x - 3x + 21 = 0 => x(x - 7) - 3(x - 7) = 0 => (x - 7) (x - 3) = 0 => x = 7, 3 II. y2 + 11y + 28 =0 => y2 + 7y + 4y + 28 = 0 => y(y + 7) + 4(y + 7) = 0 => (y + 7) (y + 4) = 0 => y = -7, -4 Hence, x > y.
- Which two signs should be interchanged to correct the given equation?
5 + 3 × 8 – 12 ÷ 4 = 3 In a certain code of language, ‘+’ represents ‘x’, ‘-‘ represents ‘+’, ‘x’ represents ‘÷’ and ‘÷’ represents ‘-‘ what ...
What will be the value of expression if the numbers/digits ‘(8)’ and ‘(9)’ are interchanged?
168 ÷ 6 × 32 ÷ 9 × 7 + 8 + 11
...A $ B means A X B, A & B means A - B, A % B means A ÷ B and A # B means A + B, then what is the value of 320 & 80 # 120 % 24 $ 50?
- Which two signs should be interchanged to correct the given equation?
5 + 3 × 8 – 12 ÷ 4 = 3 After interchanging the given two signs, what will be the value of the given equation? + and ÷
128 - 45 ÷ 72 + 9 X 11
Which two signs should be interchanged to make the below equation mathematically correct?
9 ÷ 3 + 6 – 6 × 2 = 30
A shopkeeper sells rice in such a way that the selling price of 950 gm is the same as the cost price of one kilogram. Find his gain percent.
If ‘÷’ means ‘addition’, ‘+’ means ‘subtraction’, ‘-’ means ‘multiplication’, and ‘x’ means ‘division’, what will be th...
If A denote ÷, B denotes x, C denotes + and D denotes -, what is the value of the given expression?
32 B 40 A 8 C 10 D 12
Relevant for Exams:
