√18 = [tex] \sqrt{9*2} =3* \sqrt{2} [/tex]
√288 = [tex] \sqrt{144 * 2} = 12 \sqrt{2} [/tex]
√98 =[tex] \sqrt{49*2} =7* \sqrt{2} [/tex]
√200 = [tex] \sqrt{100*2} =10 * \sqrt{2} [/tex]
(3* [tex] \sqrt{2} [/tex] + 12 * [tex] \sqrt{2} [/tex] )- (7* [tex] \sqrt{2 [/tex] + 10 * [tex] \sqrt{2} [/tex])
=[tex]15 \sqrt{2} -17 \sqrt{2} =-2 \sqrt{2} [/tex]
