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Evaluation Day2.pptx

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Evaluation Day2.pptx

  1. 1. Evaluation of Algebraic Expression M7AL-IIc-4
  2. 2. REVIEW: Evaluate the ff.: Given: x = 5, y = 3, z = -2 1.) 3 (2x + y) 2.) z4 – 2y 2
  3. 3. Hanging Question The costs of a pack of potato chips, a can of soft drinks, and a pack of biscuits are P12, P18 and P25, respectively. Vincent wants to buy x packs of potato chips, y can of soft drinks, and z packs of biscuits. Find the total cost if he buys 4 packs of potato chips, 6 cans of
  4. 4. Activity Directions: A square is a “magic square” if the sums of the numbers in a row, column, and diagonal are the same. This special sum is called the magic constant. Find the magic constant if x= 2, y = 4, and z = 1.
  5. 5. Find the magic constant if x= 2, y = 4, and z = 1. x xy + 1 (y + z) - z xy - z y + z x + 1 x + y x - z xy
  6. 6. Discussion: To evaluate algebraic expression is to find its numerical value by substituting the given set of numbers in place of letters or variables. Steps to follow in evaluating algebraic expressions.  Substitute the given values for each variable.  Simplify first the expressions within the grouping symbols.  Simplify the expressions with exponents.
  7. 7. Examples: Evaluate using the given values. a = 1, b = 2, c= 3, x = -3, y= -2, z = -1. 1.) 2a + b – c = 3 2.) 16 (x – y ) + 12 (a + z) = -16 3.) 3c – 5z2 = 4 4.) ab/y2 = 1/2 5.) 3a/5 - 7b = -67/5 or -13 2/5
  8. 8. Application: 1.) Evaluate 3x – 2y + 5 when x = 2 and y = 4 2.) Evaluate 4( a – 3) + 3 ( a + 2) when a = 5 3.) Evaluate ( 5y÷ 3 ) + 2 ( y – 6 ) when y = 9 4.) Evaluate 2a(4x2) 3y when a = 1, x= -3 and y = 3. 5.) Evaluate 3a – 7b 2a + 6b if a =1 and b = 2 6.) Evaluate 6 –b ( y + z) if a = 1, b=2, y = -1 and z = 0
  9. 9. Evaluation: Direction: Choose the letter of the correct answer. Evaluate the value of each expression if: a = 1, b= -1 , c = 2, x= -2, y =1, z = 0 1.) 8ab + 3bc – 12 a.) 0 b.) 22 c.) 26 d.) -26 2.) 3xy + 15 a.) 0 b.) 14 c.) 16 d.) -16 15 3.) 3x3 + 7y – 4z a.) 8 b.) 17 c.) -17 d.) -8 4.) bc + c + 2 a.) 0 b.) 2 c.) 4 d.) 6 2 xy ay 5.) 2 ( x – 8) + x a.) 0 b.) -2 c.) -16 d.) -22
  10. 10. Assignment 1.)Evaluate (a + b) – 24 if a = 3 and b = 2 2.) Evaluate 2a + b + c2 if a= 9, b= 13 and c = 6 3.) Evaluate if a = -2, b = 3, c = -1 4.) Evaluate 3a + [ { 4 (b + c2) } – (b – a) ] if a = -2, b = 3, c = -1 5.) Evaluate {2 ( 3 – b2)} – (c – b) if b = -1 and c = -2

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