Question

Me ajudemm com o exercício prfvrr

Answer 1

a)20-5=15

b)9^2-2.9=81-18=63

c)2^3+8=8+8=16

d)b^2-4.a.c= 3^2-4.2.5= 9-40 = -31

2°)

√(−5)^2−4×2×2

√25−16

√9

3