Question

The value of f(x) = 5x−4x2+3 when x = -1, is:​

Answer 1

Answer:

-10

Step-by-step explanation:

f(x) = 5x-4×2+3

x=-1

f(-1) = 5×(-1)-4×2+3

= -5-8+3

= -10

Answer 2

The value of p(x) = 5x - 4x² + 3 for x = - 1 is - 6

Given :

The polynomial p(x) = 5x - 4x² + 3

To find :

The value of p(x) = 5x - 4x² + 3 for x = - 1

Solution :

Step 1 of 2 :

Write down the given polynomial

The given polynomial is p(x) = 5x - 4x² + 3

Step 2 of 2 :

Find the required value

The value of p(x) = 5x - 4x² + 3 for x = - 1 is obtained by putting x = - 1 in the polynomial p(x) = 5x - 4x² + 3

Hence the required value is given by

$\displaystyle \sf{ \implies p( - 1) = 5 \times ( - 1) - 4 \times {( - 1)}^{2} + 3 }$

$\displaystyle \sf{ \implies p( - 1) = - 5 - 4 + 3 }$

$\displaystyle \sf{ \implies p( - 1) = - 6 }$

Hence the value of p(x) = 5x - 4x² + 3 for x = - 1 is - 6

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