4а^2+b
9x-(c^2+3x^2)
x^2+14x+49-10x
(2a-b)(2a+b)+b^2=4a^2-b^2+b^2=4a^2
(x+7)^2-10x= x^2+14x+49-10x=x^2+4x+49
9x^2 - (c+3x)(c-3x)=9x^2-(c^2-9x^2)=9x^2-c^2+9x^2=18x^2-c^2
5b^2-(a-2b)^2=5b^2-(a^2-4ab-4b^2)=5b^2-a^2+4ab+4b^2=9b^2-a^2+4ab
4а^2+b
9x-(c^2+3x^2)
x^2+14x+49-10x
(2a-b)(2a+b)+b^2=4a^2-b^2+b^2=4a^2
(x+7)^2-10x= x^2+14x+49-10x=x^2+4x+49
9x^2 - (c+3x)(c-3x)=9x^2-(c^2-9x^2)=9x^2-c^2+9x^2=18x^2-c^2
5b^2-(a-2b)^2=5b^2-(a^2-4ab-4b^2)=5b^2-a^2+4ab+4b^2=9b^2-a^2+4ab