Practice Quiz

SAT Math Practice Exam

Category - Mathematics - Hard

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If x=5 and y=-5, what is the value of y2 - 2y + 2x?
  1. 15
  2. 25
  3. 45
  4. 55
Explanation
Answer C- It is simply putting values with due care of positive and negative sign
y2 - 2y + 2x = (-5)2 - 2(-5) +2 (5) = 25 +10+10 = 45

Key takeaway: Remember four simple rules of multiplication of positives (+) and negative (-) numbers.
Pos x pos = pos 2x3 = 6
Neg x neg = pos -2 x -3 = 6
Pos x neg = neg 2 x -3 = -6
Neg x pos = neg -2 x 3= -6
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