Introduction to algebra

Advanced Math 7 · Unit 3 · algebra-foundations-7

algebra-foundations-7

Name ______________________________Date ______________

1.
In the expression $5x^2 - 3x + 7$ , what is the coefficient of $x$ ?
Answer: ______________
2.
Write an expression for “seven less than twice a number $n$ .”
Answer: ______________
3.
Here are four algebraic sentences.

(i) $3x + 2 = 11$ (ii) $A = \pi r^2$ (iii) $2(x + 3) = 2x + 6$ (iv) $4x - 7$

Which one is an identity — true for every value of $x$ ?
1. (A)
  (i)
2. (B)
  (ii)
3. (C)
  (iii)
4. (D)
  (iv)
4.
Which of these is an expression (not an equation)?
1. (A)
  $x = 5$
2. (B)
  $\dfrac{1}{2}x - 4$
3. (C)
  $2x + 3 = 9$
4. (D)
  $y = 3x$
5.
What is the value of $x^3 - 2x^2 + 3x - 4$ when $x = -2$ ?
Answer: ______________