Question

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$x {}^{2} - 196 = 0 \ 1.7x {}^{2} = 0 \ 8x {}^{2} = 128 \ 3x {}^{2} - 48 = 0 \ 7x {} {}^{6} - x = 0 \ x = - 25$

Answer 1

1)$x^{2} -196=0\x^{2} - 14^{2} =0\(x-14)(x+14)=0\left { {{x-14=0} atop {x+14=0}} right. \left { {{x=14} atop {x=-14}} right.$

2)$1.7x^{2} =0\x^{2} =0\x=0$

3)$8x^{2} =128\x^{2} =frac{128}{8} =16\x=frac{+}{-} 4$

4)$3x^{2} -48=0\3x^{2} =48\x^{2} =16\x=frac{+}{-} 4$

5)$7x^{6} -x=0\x(7x^{5} -1)=0\x=0\7x^{5} -1=0\7x^{5} =1\x^{5} =frac{1}{7} \x=sqrt[5]{frac{1}{7} }$