Question

a/ (3x − 2). (9x + 6x + 4)

b/ (x − 5). (x + 5) − (x + 2) + 4x

c/ (3x − 10x + 13x − 10) ∶ (x − 2) giúp em bài nay

 

Answer 1

\(\left(x-5\right)\left(x+5\right)-\left(x+2\right)+4x\)

\(=\left(x^2-5^2\right)-\left(x+2\right)+4x\)

\(=x^2-25-x-2+4x\)

\(=x^2+3x-27\)

Answer 2

(3x-2).(9x+6x+4)

=27x^2+18x^2+12x-(18x+12x+8)

=27x^2+18x^2+12x-18x-12x-8

=(27x^2-18x^2)+18x-8

=9x^2+18x-8

mk ko chắc là đúng ko nha nên néu sai thì sorry nha UwU