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evaluate expression for x = 4 and y = -2 Q:25x 3 - 4y 3 - 4y 2 x step 1:25(4) 3 - 4(-2) 3

evaluate expression

for x = 4 and y = -2

Q:25x3 - 4y3 - 4y2 x

step 1:25(4)3 - 4(-2)3 - 4(-2)2 4

step 2:25(64) -4(-8) -4(-4) 4

step 3:1600- 32 - 16 - 4 = 1548

I know that 1548 is not the correct answer but i am not sure where it went wrong.. did I forget a rule or something?

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