Question

(x-5)²-x(x+3)
(3a-b)(3a+b)+b²+7
спростити вираз ​

Answer 1

(x-5)²-x(x+3)=x²-10x+25-x²-3x=-13x+25

(3a-b)(3a+b)+b²+7=9a²-b²+b²+7=9a²+7