Question

2) Determine whether than roots of the quadratic equation or not
x2 + 4x - 5 = 0 x = 1, -1

Answer 1

Answer:

To check whether x= 1,-1 are the roots of the equation, let's apply factor theorem,

if x= 1,-1 are roots then their remainder should be zero.

hence,

x²+4x-5 = (1)²+4(1)-5 = 0

so 1 is a root,

then

x²+4x-5 = (-1)²+4(-1)-5 = 1-4-5 = -8 is not zero

so only 1 is a root and -1 is not a root of the equation.

Hope it helps.

Mark Brainer.

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Teacher.