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rezolvati in R
a)2x^2+7x-8=0
b)-x^2+10x+2=0


Răspuns :

2x^2+7x-8=0
delta=7^2-4*2*(-8)=49+64=113
x1,2=(-7+-rad(113))/4.

-x^2+10x+2=0 <=> x^2-10x-2=0
delta=(-10)^2-4*1*(-2)=100+8=108
x1,2=(10+-rad(108))/2=5+-3rad(2).