Question

ОЧЕНЬ СРОЧНО ПЖ ПОМОГИТЕ
10x2-(2x-3)(5x-1)=31
10x2-( - во второй степени)

Answer 1

10x² - ( 10x² - 2x - 15x + 3) = 31
10x² - ( 10x² - 17x + 3) = 31
10x² - 10x² + 17x - 3 = 31
17x = 31 + 3
17x = 34
x = 34/17
x = 2