Question

4. Determine whether the values given against
each of the quadratic equations are the roots of
the quadratic equation or not.
(1) x2 + 4x - 5=0, x=1, -1
botituting _1
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Answer 1

Answer:

when x=1,

1*2+4*1-5=0

2+4-5=0

6-5=0

1=0

x=1

when x =-1,

1*2+4*-1-5=0

2+4-6=0

6-6=0

x=0