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All questions of Expressions and Formulae for Class 9 Exam
What is the solution set for x2 − 16 = 0?- a)x = 4
- b)x = -4
- c)x = 4, -4
- d)x = 16
Correct answer is option 'C'. Can you explain this answer?
What is the solution set for x2 − 16 = 0?
a)
x = 4
b)
x = -4
c)
x = 4, -4
d)
x = 16
 | C K Academy answered |
Add 16 to both sides:
x2 = 16
Take the square root of both sides:
x = ±√16
Since √16 = 4, the solutions are:
x = 4
x = −4
x2 = 16
Take the square root of both sides:
x = ±√16
Since √16 = 4, the solutions are:
x = 4
x = −4
Solve the equation for x: 3x − 7 = 14.- a)x = 7
- b)x = 9
- c)x = 5
- d)x = 21
Correct answer is option 'A'. Can you explain this answer?
Solve the equation for x: 3x − 7 = 14.
a)
x = 7
b)
x = 9
c)
x = 5
d)
x = 21
| | C K Academy answered |
3x - 7 = 14
Add 7 to both sides of the equation to isolate the term with x:
3x - 7 + 7 = 14 + 7
3x = 21
Divide both sides of the equation by 3 to solve for x:
x = 21/3 = 7
Simplify the expression: 3(2x − 5) + 4(3x + 2).- a)10x - 7
- b)12x - 7
- c)10x + 7
- d)12x + 7
Correct answer is option 'B'. Can you explain this answer?
Simplify the expression: 3(2x − 5) + 4(3x + 2).
a)
10x - 7
b)
12x - 7
c)
10x + 7
d)
12x + 7
| | C K Academy answered |
Distribute and combine like terms: 6x − 15 + 12x + 8 = 18x − 7.
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