Question

Calcule o valor numerico da expressão b²-4.a.C para A=1 B= 2 e c= -8

Answer 1

∆ = b² -4.a.c

∆ = 2² -4.1.(-8)

∆ = 4 +32

∆ = 36 ✓

Answer 2

$\large\boxed{\begin{array}{l} \rm\Delta =b {}^{2} - 4ac~~~~\rightarrow \begin{cases} \rm \: a = 1 \\ \rm \: b = 2 \\ \rm \: c = - 8\end{cases} \\ \Delta =2 {}^{2} - 4 \: . \: 1 \: . \: ( - 8) \\\\ \Delta = 4 + 32\\ \\ \boxed{\Delta = 36} \checkmark\end{array}}$