X2-4X-77=0

1.	X2-4X-77=0
Answer» Hi x²-4x-77 = 0\xa0x²-11x+7x-77 = 0\xa0(splitting the middle term)x(x-11)+7(x-11) = 0(x+7)(x-11) = 0\xa0x + 7 = 0 and x - 11 = 0x = -7 and x = 11 If ab=13.3cmac=11.9cm and ec=5.1cm find ad

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