Question

when x= -1 what is the value of polynomial 2x²+5x³+7
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Answer 1

Answer:

when x = -1 the value of the polynomial 2x²+5x³+7 is 4

Step-by-step explanation:

given value of x = -1

Now x^2 = (-1)^2 = 1

and x^3 = (-1)^3 = -1

given polynomial is

2x²+5x³+7

putting the value of x in the given polynomial we get ,

2(-1)^2 + 5(-1)^3 + 7

= 2 × 1 + 5 × (-1) + 7  [ ∴ x^2 = (-1)^2 = 1

                                  & x^3 = (-1)^3 = -1  ]

= 2 - 5 + 7

= 4

hence when x = -1 , the value of the polynomial 2x²+5x³+7 is 4

Answer 2

Answer:

We will get the value is 4.

Step-by-step explanation:

• As per the question we have to evaluate the given data.

         Given data:- x=-1.

        To find:- Value of 2x²+5x³+7.

        Solution:-

• To solve the above question we will follow the BODMAS rule.

• BODMAS is an order of mathematic operations.

• It stands for,

           B= bracket

           O= order of power or rules

           D= division

           M= multiplication

           A= addition

           S= subtraction

       Now put the value of x=-1 in the given data we get,

          $2x^{2} +5x^{3} +7\\=2(-1)^{2} +5(-1)^{3}+7\\=2(1)+5(-1)+7\\=2+(-5)+7\\=-3+7\\=4$