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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
to find the values of x for which the expression is underlined, let x2 + x - 2 = 0
By factorizing, we have (x + 2)(x - 1) = 0
when x + 2 = 0, when x - 1 = 0, x = -2 or x = 1
The two values are -2 and 1