Question

2,5(4x-5)-(2-3x)(5x+1)
Решить подробненько)))

Answer 1

2,5*4х - 2.5*5 - (2*5х + 2*1 - 3х*5х - 3х*1) = 10х - 12.5 - (10х + 2 - 15х² - 3х) = 10х - 12.5 - 10х - 2 + 15х² + 3х = -12.5 - 2 + 15х² + 3х = 15х² + 3х - 14,5

Answer 2

$2,5(4x-5)-(2-3x)(5x+1)=2.5*4x-2.5*5-(2*5x+2- \\ 3x*5x-3x)=10x-12.5-(7x+2-15 x^{2} )=3x-14.5+15 x^{2}$