Question

DETERMINE O VALOR NUMÉRICO PARA AS EXPRESSÕES ALGÉBRICAS ABAIXO:
a) 9×13y , P/x=4 e y= 2
b) 5a+3b+ab , P/a=5 e b= -2
c) x²-2×-5 , P/x= 7
d) x²-2×-5 , P/x= -7
e) m³-2m²+4m-10 , P/m= -2
ME AJUDEM POR FAVOR❗​​

Answer 1

$a) \\ 9x \: . \: 13y \\ 9 \: . \: 4 \: . \: 13 \: . \: 2 \\ \boxed{\boxed{\boxed{936}}}$

$b) \\ 5a + 3b + ab \\ 5 \: . \: 5 + 3 \: . \: ( - 2) + 5 \: . \: ( - 2) \\ 25 - 6 - 10 \\ \boxed{\boxed{\boxed{9}}}$

$c) \\ x {}^{2} - 2x - 5 \\ 7 {}^{2} - 2 \: . \: 7 - 5 \\ 49 - 2 \: . \: 7 - 5 \\ 49 - 14 - 5 \\ \boxed{\boxed{\boxed{30}}}$

$d) \\ x {}^{2} - 2x - 5 \\ ( - 7) {}^{2} - 2 \: . \: ( - 7) - 5 \\ 49 - 2 \: . \: ( - 7) - 5 \\ 49 + 14 - 5 \\ \boxed{\boxed{\boxed{58}}}$

$e) \\ m {}^{3} - 2m {}^{2} + 4m - 10 \\ ( - 2) {}^{3} - 2 \: . \: ( - 2) {}^{2} + 4 \: . \: ( - 2) - 10 \\ - 8 - 2 \: . \: 4 + 4 \: . \: ( - 2) - 10 \\ - 8 - 8 - 8 - 10 \\ \boxed{\boxed{\boxed{ - 34}}}$

att. yrz