Question

without actual squaring find the value of the
following :-

1:)
$21 {}^{2} - 20 {}^{2}$
2:)
$34 {}^{2} - 33 {}^{2}$
3:)
$95 {}^{2} - 94 {}^{2}$

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Answer 1

Answer:

1) 21² - 20² = (21+20) (21-20)

= (41) (1)

= 41

2)34² - 33² = (34+33) (34-33)

= (67) (1)

= 67

3)95² - 94² = (95+94) (95-94)

= (189) (1)

= 189