Question

упростите выражение
$(3a - 2) ^{2} - (3a + 1)(a + 5)$

Answer 1

$(3a - 2) ^{2} - (3a + 1)(a + 5) = 9a^2-12a+4-(3a^2+a+15a+5) =$
$= 9a^2-12a+4-3a^2-a-15a-5 = 6a^2-28a-1$

Answer 2

$(3a-2) ^{2}-(3a+1)*(a+5) \\-9a^{2} -12a+4-(3a^{2} +15a+a+5) \\9a^{2} -12a+4-(3a^{2} +16a+5) \\9a^{2} -12a+4-3a^{2} -16a-5 \\6a^{2} -28-1.$