Question

(5c+4)(3c−1)−15c^2=17​

Answer 1

Привет!!!

$(5c + 4)(3c - 1) - 15 {c}^{2} = 17$

$15 {c}^{2} - 5c + 12c - 4 - 15 {c}^{2} = 17$

$7c = 21$

$c = 3$

Удачи;)

Answer 2

Ответ:

$(5c+4)(3c-1)-15c^{2} =17\\15c^{2} -5c+12c-4-15c^{2} =17\\7c-4=17\\7c=21\\c=3$