Question

упростить выражение (5-3x)^2-4(2x-7) ; a(a+2b)-(a-b)^2

Answer 1

1
25-30x+9x²-8x+28=9x²-38x+53
2
a²+2ab-a²+2ab-b²=4ab-b²

Answer 2

 (5-3x)^2-4(2x-7) = 25-30x+9x^2-8x+28=9x^2-38x+53;
a(a+2b)-(a-b)^2 = a^2+2ab-(a^2-2ab+b^2)=a^2+2ab-a^2+2ab-b^2=4ab-b^2