## Year 1 Homework #23

Name ________________________

1). (1 point each) Evaluate the following expressions. First rewrite the expression with the value of X substituted for X. Then simplify it down to one number. I will rewrite the first expression for you:

 a). X2 - 1 for X = 8 Substitute: 82 - 1Simplify: _______ b). 3X2 + 2 for X = 4 _______ c). 80 - X2 for X = 8 _______ d). X2 + X - 4 for X = 3 _______
2). (1 point each) Combine all like terms (X's with X's) and solve these equations. Rewrite the equation with all the X's together first. I will rewrite the first equation for you!

 a). X + X + X + X = 48 Equation: 4X = 48X = _______ b). X + 2X + X + X = 30 Equation:_________________X = ___________________ c). X + 2X + 2X + X = 42 Equation:_________________X = ___________________ d). 3X + 5X = 64 Equation:_________________X = ___________________ e). 5X - 3X = 20 Equation:_________________X = ___________________ f). 2X + 6X - 3X = 35 Equation:_________________X = ___________________ g). 5X - 3X + 2 = 18 Equation:_________________X = ___________________ h). X + 2X + 13 - X - 8 = 23 Equation:_________________X = ___________________