Algebra

Algebra problems to solve.  Homework 3
4. Simplify the expression.
(x ˆ’ 3)(2x ˆ’ 4) ˆ’ (x + 2)(x ˆ’ 6)

7. Factor the expression by using areas.
x2 + x ˆ’ 30

9
Suppose that a spreadsheet contains the following values.

Determine the value of cell E1 if it contains the following formulas.
(a)    +A1 + B1
E1 =

(b)    +2*A1 + 5*B1
E1 =

(c)    +C1*(A1 + 4*B1)
E1 =

(d)    +A1 + ‹¯ + D1 or @sum(A1 . . D1)
E1 =

10.

Solve the equations.
(a)
2D + 4 = 14

D =

(b)
20E ˆ’ 5 = 0

E =