Question

Delta, alguém pode me ajudar?

Answer 1

A) x²+12x-12=1
x²+12x-12-1=0
x²+12x-13=0
Δ=b²-4ac=12²-4.1(-13)=196
x=-b+- √Δ/2a
x=-12+-√196/2.1
x=-12+-14/2
x'=-12+14/2=1
x"=-12-14/2=-13