Question

determine o valor numérico de : b2-4a c ,se a=1b=-5 c=4
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Answer 1

Resposta:

${b}^{2} - 4 \times a \times c \\ a = 1 \: \: b = - 5 \: \: c = 4 \\ \\ ( - 5)^{2} - 4 \times 1 \times 4 = \\ = 25 - 16 = 9$