September 2018 0 68 Report
2 x^{2} - 3x - 4 = 0
maka  x1^{2} +  x2^{2 = ....?
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dari Tamarasrirahayu

Jawabanmu

tamarasrirahayu
INGAT :
 a^{2} + b^{2} =(a+b) ^{2} -2ab \\ x1 ^{2} + x2^{2} =(x1+x2) ^{2} -2x1x2
x1 + x2 = -b/a = -(-3)/1 = 3
x1x2 = c/a = -4/1 = -4

tinggal sub.
x1 ^{2} + x2^{2} =(3) ^{2} -2(-4) \\ x1 ^{2} + x2^{2}=9+8=17



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