(7.5 \times 7.5 + 37.5 + 2.5 \times 2.5) is equal to :

RRB RPF RPSF SI and CONS Model Papers 9 with solutions

Question : 44 of 120

Marks: +1, -0

(7.5 × 7.5 + 37.5 + 2.5 × 2.5)

is equal to :

Solution:

(1)

? = (7.5 × 7.5 + 37.5 + 2.5 ×2.5)

= [(7.5)^{2}+2 × 7.5 × 2.5+ . (2.5)^{2} ]

=[7.5+2.5]^{2}=(10)^{2}=100

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