-5y(y+3)+(y-4)²=
-5у²-15у+у²-8у+16=
-4у²-23у+16
3(x-2)²-3x²=
3(х²-4х+4)-3х²=
3х²-12х+12-3х²=
12-12х
Как-то так, удачи)))
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Answers & Comments
-5y(y+3)+(y-4)²=
-5у²-15у+у²-8у+16=
-4у²-23у+16
3(x-2)²-3x²=
3(х²-4х+4)-3х²=
3х²-12х+12-3х²=
12-12х
Как-то так, удачи)))