Question

найдите значение выражения (8х-3у)^2 +16х(-2х+3у)-32х^2 при х=1,8 ; у= √ 7

Answer 1

(8*1.8-3√7)²+16*1.8(-2*1.8+3√7)-32*3.24= (14.4-3√7)²+28.8(-3.6+3√7)-103.68=(207.36-86.4√7+63)-103.68+86.4√7-103.68=207.36+63-207.36= 63