Respuesta :
Answer:
-18
Step-by-step explanation:
Follow PEMDAS. So first you do 2x2=4 then 4-7x= -3-15= -18
Good evening ,
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Answer:
x’=5
x’’=(-3)/2
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Step-by-step explanation:
Δ=(-7)²-4×(2)×(-15)=49+120=169
√Δ=√169=13
then
x’=(7+13)/4=20/4=5
x’’=(7-13)/4=(-6)/4=(-3)/2.
:)
