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2m² + 2n² = 2(m² + n²)
= 2{(m + n)² - 2mn}
= 2 { ( - 2.}
= 2.{ - 2 .}
= 2(9 - 8)
= 2 . 1
= 2
m.n= 4/1=4
PK baru
2m2 + 2n2= 2(m2+n2)
=2((m+n)2-2mn)
=2((-3)2-2.4)
=2.(9-8) = 2.1 = 2
2m2.2n2 = 4 (mn)2
=4(4)2=4.16=64
jd pk baru :
x2-2x+64=0