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9 October, 06:26

What are the solutions to the equation y2=49?

A.) - 5 and 5

B.) - 4 and 4

C.) - 7 and 7

D.) - 6 and 6

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Answers (2)
  1. 9 October, 07:23
    0
    C.-7 and 7

    Step-by-step explanation:

    y2=49

    y2-49=0

    We will first factorise the expression.

    As per property:

    a2-b2 = (a-b) (a+b)

    So,

    y2-49 = (y-7) (y+7)

    We now equate the factors to zero to find the solutions:

    y-7=0, y=7

    y+7=0, y=-7
  2. 9 October, 08:56
    0
    B.) - 4 and 4
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