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प्रश्न
Factorise the following expression.
y2 − 4
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उत्तर
y2 − 4
Let us identify a and b as the difference of squares.
a = y2
b = 22 = 4
= (y)2 − (2)2
a2 − b2 = (a + b) (a − b)
(y)2 − (2)2 = (y + 2) (y − 2)
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Match the following :
| Column A | Column B |
| (a) `x/2` = 10 | (i) x = 4 |
| (b) 20 = 6x − 4 | (ii) x = 1 |
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