The value of the polynomial 5x - 4x² + 3, when x = -1 is
a. -6
b. 6
c. 2
d. -2
Solution:
It is given that
p(x) = 5x - 4x² + 3
We have to find the value when x = -1
p(-1) = 5(-1) - 4(-1)² + 3
By further calculation
p(-1) = -5 - 4 + 3
So we get
p(-1) = -9 + 3
p(-1) = -6
Therefore, the value is -6.
✦ Try This: The value of the polynomial 3x - 5x² + 2, when x = -2 is
It is given that
p(x) = 3x - 5x² + 2
We have to find the value when x = -2
p(-2) = 3(-2) - 5(-2)² + 2
By further calculation
p(-2) = -6 - 20 + 2
So we get
p(-2) = -26 + 2
p(-2) = -24
Therefore, the value is -24.
☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 2
NCERT Exemplar Class 9 Maths Exercise 2.1 Problem 6
The value of the polynomial 5x - 4x² + 3, when x = -1 is a. -6, b. 6, c. 2, d. -2
Summary:
The terms of polynomials are defined as the parts of the expression that are separated by the operators "+" or "-". The value of the polynomial 5x - 4x² + 3, when x = -1 is -6
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