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x2 - 4x + a = 0 this equation has a double root, x = sq. root of a, only and only if a = (4/2)2 = 4. So that x = 2 is a double solution.
It has one double solution.
No. 3a 12 plus a 6 is not a solution Of an equation.
There can be no solution because there is no equation (or inequality) but only an expression.
What is the number of integral solution to x plus y plus z equals 100?
There is no equation - only an expression. So there are no solutions (or solution intervals).