NIACL Model Paper 8 with solutions for free online practice

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Question : 33 of 100

Marks: +1, -0

(4.5)^2 - (1.5)^2 = ?^2

$9√2$
9
$3√2$
18
$4√3$

Solution:

(3)

?^2 = (4.5)^2 - (1.5)^2

=>

?^2 = (4.5 + 1.5) (4.5-1.5)

[∵a^2 - b^2 = (a + b) (a - b)]

=>

?^2 = 6 × 3

=>

? = √{6×3} = 3√2

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