8(30) - 40 = 240 - 40 = 200.
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explain how to evaluate an algebraic expression for given variables. how would we evaluate the expression "3x-4y+9" when x=2and y=5?
It is x*x + y*y*y*y
Without further information, it is not possible to evaluate or simplify the expression.
When x = 2, 3x + 5 = 11.
You don't "solve" an expression. You can solve an equation; an expression can be simplified or otherwise manipulated, and if you know the value of "x" (in this case), you can evaluate its value.