use the formula to multiply the following
(x+y) (x-y)​

Question

use the formula to multiply the following
(x+y) (x-y)​

in progress 0
Serenity 3 months 2021-07-25T20:32:25+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-07-25T20:33:31+00:00

    Answer:

    Correct option is

    C

    (9, 6)

    x+y=15 —– (1)

    x−y=3 —– (2)

    First use formula for cross multiplication method:

    b

    1

    c

    2

    −b

    2

    c

    1

    x

    =

    c

    1

    a

    2

    −a

    1

    c

    2

    y

    =

    a

    2

    b

    2

    −a

    2

    b

    1

    −1

    So, from equation (1) and (2) we can write the value of a, b and c.

    1×3−(−1)×15

    x

    =

    15×1−1×3

    y

    =

    1×(−1)−1×1

    −1

    3+15

    x

    =

    15−3

    y

    =

    −1−1

    −1

    18

    x

    =

    12

    y

    =

    −2

    −1

    18

    x

    =

    −2

    −1

    x=

    −2

    −18

    =9

    12

    y

    =

    −2

    −1

    y=

    −2

    −12

    y=6

    The solution is (9, 6)

    0
    2021-07-25T20:34:19+00:00

    solution=(x+y)(x-y)

    using identities (a+b)(a-b)=a^2-b^2

    x^2y^2

    this is ans

    (Aliter)

    (x+y)(x-y)

    x(x-y)+y(x-y)

    x^2 -xy+xy-y^2 (-xy and +xy is cancelled due to both sign is + and ,then this sign is put the same value so then ot is cancelled)

    x^2y^2 (-xy+xy is cancelled then ans will get )

    i hope it will help you

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