Question

7(a+b)^2-14ab решите плиз

Answer 1

7(a+b)^2-14ab7(a^2+2ab+b^2)-14ab= 7a^2+14ab+7b^2-14ab=7a^2+7b^2=7(a^2+b^2)

Answer 2

7(а^2+2ав+в^2) - 14ав =7а^2 + 14ав +7в^2 -14ав =7(а^2 + в^2)