If x=5 and y=-5, what is the value of y2

Name: If x=5 and y=-5, what is the value of y2 - 2y + 2x? A)15 B)25 C)45 D)55
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Question

If x=5 and y=-5, what is the value of y2 - 2y + 2x?
A)15
B)25
C)45
D)55

Quizplus · Accepted Answer

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