Question

Разложите на множители и найдите значение выражения

 

Answer 1

$1) (x+3)(x^2-3x+9)=x^3+27 \ (frac{1}{2})^3+27=27frac{1}{8}=27,125$

$2) 1-(2x-3)^2=(1-(2x-3))(1+(2x-3))= \ =(4-2x)(2x-2)=4(2-x)(x-1)$

$3) 1-(8a-3)^2=(1-(8a-3))(1+(8a-3))= \ =(4-8a)(8a-2)=8(1-2a)(4a-1)$

$4) 9-(2c-1)^2=(3-(2c-1))(3+(2c-1))= \ =(2-2c)(2+2c)=4(1-c)(1+c)$