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Question
To decide whether 1 is a root of quadratic equation x2 + 4x – 5 = 0 or not, complete the following activity.
Activity: When x = (______)
L.H.S. = 12 + 4(______) – 5
= 1 + 4 – 5
= (______) – 5
= ______
= R.H.S
Therefore x = 1 is a root of quadratic equation x2 + 4x – 5 = 0
Solution
When x = 1,
L.H.S. = 12 + 4(1) – 5
= 1 + 4 – 5
= 5 – 5
= 0
= R.H.S.
Therefore x = 1 is a root of quadratic equation x2 + 4x – 5 = 0.
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