Factorise : (5a)²-(4b)²-28bc
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\left[a _{1}\right] = \left[ \left( \frac{-1}{5}\,i \right) \,\sqrt{\left( \left( -16\right) \,b^{2} - 28\,bc\right) }\right][a1]=[(5−1i)√((−16)b2−28bc)]
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