Question

determine o produto notavel a) (mx-1)²      c) (3x+5)²

Answer 1

a) (mx-1)²
(mx-1).(mx-1)
mx²-mx-mx+1
mx²-2mx+1

c) (3x+5)²
9x²+15x+15x+25
9x²+30x+25

Answer 2

Lembre-se

$(a+b)^2~\to~a^2+2ab+b^2\\(a-b)^2~\to~a^2-2ab+b^2$

a )

$\boxed{(mx-1)^2~\to~(mx)^2-2mx+1^2~\to~\boxed{m^2x^2-2mx+1}}}$

c )

$\boxed{(3x+5)^2~\to~9x^2+2*3x*5+25~\to~\boxed{9x^2+30x+25}}$