Question

4. Determine whether the values given against each of the quadratic equation are the
roots of the equation.
5
(1) x² + 4x - 5 = 0, x= 1, -1





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Answer 1

Answer:

put x is equal to 1 in equation first

1²+4×1-5=0

L.H.S = 1+4-5

= 5-5

=0

R.H.S= 0

L.H.S=R.H.S

X=1 IS THE ROOT OF GIVEN QUADRATIC EQUATION

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

To find whether they are roots or not... first we will check if by putting their values, we get the answer as 0 or not... if yes, then it is a root

x = 1

=> 1^2 + 4*1 -5

=> 5-5 = 0

Therefore yes it is a root of the given polynomial

x = -1

=> 1*(-1)^2 + 4*(-1) -5

=> 1 -4 -5

= -8

Therefore no.. its not a root of the given polynomial