Determine by substitution if 5 isvtherot of 2x+5=20
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To check whether a number is a root of a given equation, put the number in that equation in place of the variable. if the equation is satisfied, it is a root of the equation, else not.
Here, LHS = 2(5) + 5 = 15 ≠ 20
The equation is not satisfied. hence it is not a root of the given equation.
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