36.Find the following using suitable identities. a) (7a – 4b) (7a + 4b) b) 501 x 502 Would appreciate if you send a pic o

Question

36.Find the following using suitable identities.
a) (7a – 4b) (7a + 4b)
b) 501 x 502
Would appreciate if you send a pic of the solutions<3

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Hưng Khoa 3 weeks 2021-08-25T03:11:59+00:00 1 Answers 0 views 0

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    2021-08-25T03:13:10+00:00

    Answer:

    1) 49 {a}^{2}  - 16 {b}^{2}

    2) 251502

    Step-by-step explanation:

    a) Question :-(7a - 4b)(7a + 4b)

    Identity used here :-(a + b)(a - b) =  {a}^{2}  -  {b}^{2}

    So,

    (7a + 4b)(7a - 4b)

    =>  {(7a)}^{2}  -  {(4b)}^{2}

    =>  49 {a}^{2}  - 16 {b}^{2}

    b) Question :- 501 \times 502

    Identity used here :-(x + a)(x + b) =  {x}^{2}  + (a + b)x + ab

    So,

    501 \times 502 = (500 + 1)(500 + 2)

     =  >  {(500)}^{2}  + (1 + 2)500 + 1 \times 2

     =  > 250000 + 1500 + 2

     =  > 251502

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