Question

X^2-2x=80?????

Answer 1

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Answer 2

rearranging u get
x^2 - 2x -80 = 0
Find the roots of this quadratic equation

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Answer 3

Using the "Splitting the middle term", it can be written as
x^2 -10 x + 8x - 80 = 0
x(x - 10) +8(x - 10) = 0
(x -10) (x+8) = 0
This is possible if either (x - 10) is zero or (x + 8) is zero
If x - 10 = 0 means x = 10
If x + 8 = 0 means x = -8

Answer 4

Hence the two values of x are 10 and -8