Using Suitable Identity ,Find the value of (i) (729)2-(271)2 (ii)98×107

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Using Suitable Identity ,Find the value of
(i) (729)2-(271)2 (ii)98×107

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bonexptip 4 years 2021-08-05T08:45:41+00:00 1 Answers 83 views 0

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  1. Orla
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    2021-08-05T08:47:15+00:00
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    Answer:

    (i) 458000 (ii) 10486

    Step-by-step explanation:

    (i) (729)²-(271)²

    The identity is : a^2-b^2=(a-b)(a+b)

    (729)²-(271)² = (729-271) × (729+271)

    = 458 × 1000

    = 458000

    (ii) 98×107 = (100-2) (100+7)

    Idenity : (x-a)(x-b) = x^2+(a+b)x+ab

    (100-2) (100+7)=100^2+(-2+7)100+(-2)(7)\\\\=10000+500-14\\\\=10486

    Hence, this is the required solution.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )