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  1. If x = 93, y = 93, z = 94 then the value of (x² – y² + 10xz + 10yz) is
    1. 104784
    2. 147840
    3. 174840
    4. 184740
Correct Option: C

x² – y² + 10xz + 10yz
⇒ (x + y) (x – y) + 10z (x + y)
= (x + y) (x – y + 10z)
= (93 + 93) (93 – 93 + 10 × 94)
= 186 × 940 = 174840


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