Respuesta :

-10-15= -25

-3+(-5) - positive sign and negative sign = negative sign

-3-5= -8

-5x - 2y² + 1

Use the substitution method

-5(4)-2(-2)^2+1

(-2)(-2)= 4

-20-8+1= -28+1

= -27

Answers :

-10-15= -25

-3+(-5)=-8

-5x - 2y² + 1= -27

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