解
(x2−4x+7)log10(5)+log10(16)=4
解
x=2log10(5)4log10(5)+−12log10(5)2−16log10(5)log10(2)+16log10(5),x=2log10(5)4log10(5)−−12log10(5)2−16log10(5)log10(2)+16log10(5)
+1
十進法表記
x=3,x=1解答ステップ
(x2−4x+7)log10(5)+log10(16)=4
拡張 (x2−4x+7)log10(5)+log10(16):log10(5)x2−4log10(5)x+7log10(5)+4log10(2)
log10(5)x2−4log10(5)x+7log10(5)+4log10(2)=4
4を左側に移動します
log10(5)x2−4log10(5)x+7log10(5)+4log10(2)−4=0
解くとthe二次式
x1,2=2log10(5)−(−4log10(5))±(−4log10(5))2−4log10(5)(7log10(5)+4log10(2)−4)
(−4log10(5))2−4log10(5)(7log10(5)+4log10(2)−4)=−12log10(5)2−16log10(5)log10(2)+16log10(5)
x1,2=2log10(5)−(−4log10(5))±−12log10(5)2−16log10(5)log10(2)+16log10(5)
解を分離するx1=2log10(5)−(−4log10(5))+−12log10(5)2−16log10(5)log10(2)+16log10(5),x2=2log10(5)−(−4log10(5))−−12log10(5)2−16log10(5)log10(2)+16log10(5)
x=2log10(5)−(−4log10(5))+−12log10(5)2−16log10(5)log10(2)+16log10(5):2log10(5)4log10(5)+−12log10(5)2−16log10(5)log10(2)+16log10(5)
x=2log10(5)−(−4log10(5))−−12log10(5)2−16log10(5)log10(2)+16log10(5):2log10(5)4log10(5)−−12log10(5)2−16log10(5)log10(2)+16log10(5)
二次equationの解:x=2log10(5)4log10(5)+−12log10(5)2−16log10(5)log10(2)+16log10(5),x=2log10(5)4log10(5)−−12log10(5)2−16log10(5)log10(2)+16log10(5)