Question

me ajudem resolva a equação 4x²-8x+7=0 , sendo u = c

Answer 1

$\mathtt{4x\²-8x+7=0} \\ \\ \mathtt{a = 4} \\ \mathtt{b = -8} \\ \mathtt{c =7} \\ \\ \mathtt{\Delta = b^2-4\times a \times c} \\ \mathtt{\Delta = (-8)^2 -4 \times 4 \times 7} \\ \mathtt{\Delta = 64-16 \times 7} \\ \mathtt{\Delta = 64 -112} \\ \mathtt{\Delta = -\underline{48}} \\ \\ \\ \boxed{\boxed{\mathtt{ Por~\Delta\\ \textless \ ~0~n\~ao~existe~raizes~reais}}}$