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Activity Discussion Math Class-7 : Algebraic expressions

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  • Class-7 : Algebraic expressions

    Posted by Rahul on June 23, 2023 at 5:53 pm

    Find the value of the expression when n=-2

    -n^3+5n^2-1

    Nilanjana replied 3 months ago 2 Members · 1 Reply
  • 1 Reply
  • Nilanjana

    Member
    June 23, 2023 at 6:11 pm
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    ::

    if n = -2, then we shall put the value of n in the given expression. Putting the value of n, we get

    -(-2)^3 + 5(-2)^2 -1

    = -(-8) + (5*4) – 1

    = 8 + 20 – 1

    = 27

    Therefore, the answer is 27.

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