Question

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O valor da expressão Y= 0,25 - x²/0,5 + x Para x= -2,1 é?

Answer 1

$y~=~0,25-\frac{x^2}{0,5}+x\\\\\\y~=~0,25-2x^2+x\\\\\\Para~x~=\,-2,1\\\\\\y~=~0,25~-~2~.~(-2,1)^2~+~2,1\\\\\\y~=~0,25~-~2~.~4,41~+~2,1\\\\\\y~=~0,25~-~8,82~+~2,1\\\\\\\boxed{y~=~-6,47}$