Question

determine o valor numérico da expressão m2 -2.m.n.quando m =-1e n=1/4​

Answer 1

Olá!

m² - 2 · m · n      para   m = -1    e    n = 1/4

$(-1)^{2}-2\cdot (-1)\cdot \dfrac{1}{4} =\\ \\ \\ 1+\dfrac{2}{4} ~~=~~ 1+\dfrac{1}{2} \\ \\\\ \boxed{\dfrac{3}{2} }$

:)