Jawabanmu

2014-08-18T15:38:10+07:00
Bantuin apa ? barangkali bisa bantu :)
bantuin jwab to soal....
bantuin jwab to soal.....
2014-08-18T16:52:08+07:00
2 .  \sqrt{54+14 \sqrt{5}} +  \sqrt{12-2 \sqrt{35} } +  \sqrt{32-10 \sqrt{7} }
=  \sqrt{54+2 \sqrt{245} }+ \sqrt{12-2 \sqrt{35} }  + \sqrt{32-2 \sqrt{175} }
=  \sqrt{(49+5)+2 \sqrt{49.5} } + \sqrt{(7+5) \sqrt{7.5} } + \sqrt{(25+7)+2 \sqrt{25.7} }
=  \sqrt{49} +  \sqrt{5} + \sqrt{7} + \sqrt{5} + \sqrt{25} + \sqrt{7}
= 7 + 5 + 2 \sqrt{5} + 2 \sqrt{7}

Rumus yg digunakan diatas :  \sqrt{(a+b)+2 \sqrt{a.b} }

3.  4^{x+3} =  8^{ \frac{x-9}{2} }
 2^{2(x+3)}  =  2^{3( \frac{x-9}{2}) }
2x + 6 = (3x - 27) / 2
4x + 12 = 3x - 27
4x - 3x = -27 - 12
x = -39

Semoga Membantu