Prove that the expression can have only positive values: x^2+2x+2
4x^2-4x+6
a^2+b^2-2ab+1
x^2+y^2+z^2+2xy+5

Please help me!!

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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