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one way is to let x^2=m, then you have an equation m^2+3m-28=0, and then you solve this quadratic equation for m, and you get: m=4, or m=-7... since m represents x^2, m can only be positive (if we are dealing with real numbers), so m=-7 is not possible solution... now if m=4, the x^2=4, and solving this equation: x=2 or x=-2
An equation is a true statement. [ 75 + 4 = -2 ] is a false statement.
A simple equation, true when w = -4