SAT Math Practice Exam

Category - Mathematics - Hard

If x=-1 and y=1, then y4+x3+y2+x=
  1. -4
  2. 0
  3. 4
  4. 10
Explanation
Answer B It is simply putting values with due care of positive and negative sign
y4+x3+y2+x= 14+(-1)3+(1)2+(-1) = 1 -1+1-1 =0

Key takeaway: Remember simple rules of multiplication of positives (+) and negative (-) numbers. When you raise (-1) by an odd number you get negative sign and when you raise (-1) by an even number you get positive sign
(-1) = -1 (-1)2 = +1 (-1)3 = -1
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