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Algebraic Identity (a - b)²
Algebraic Identity (a - b)²
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1)
What is the value of (3x - 4y)²?
9x² - 16y²
9x² - 24xy - 16y²
9x² + 16y²
9x² - 24xy + 16y²
2)
What is the value of (7y - 2x)²?
4x² + 28xy + 49y²
4x² + 49y²
4x² - 14xy + 49y²
4x² - 28xy + 49y²
3)
What is the value of (2x - 5)²?
4x² - 20x + 25
4x² - 10
4x² + 20x + 25
4x² - 20x - 25
4)
What is the expansion of (5a - 2b)²?
25a² - 20ab - 4b²
25a² + 20ab - 4b²
25a² - 20ab + 4b²
25a² - 4b²
5)
What is the expansion of (a - b)²?
a² + b²
a² - 2ab + b²
a² - b²
a² + 2ab + b²
6)
If a=15 cm and b=7 cm then (a-b)² = ?
51 cm²
64 cm²
0 cm²
50 cm²
7)
If a=5 cm and b=15 cm then (a-b)² = ?
0 cm²
30 cm²
5 cm²
100 cm²
8)
If a=10 cm and b=4 cm then (a-b)² = ?
36 cm²
46 cm²
0 cm²
6 cm²
9)
What is an identity in mathematics?
A mathematical expression that is true for some values of the variables
A mathematical equation with a unique solution
An equality that is true for all values of the variables
None of all
10)
if (a-b)²= 4 and a=8 then what is the value of b=?
9
8
6
5