Question

$factorise \: {x }^{2} - 4 {x}^{2} - 77$
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Answer 1

Answer:

$x {}^{2} - 4 x{}^{2} - 77 = 0 \\ - 3x {}^{2} - 77 = 0 \\ - 3x {}^{2} = 77 \\ x {}^{2} = \frac{77}{3} \\ \sqrt{ \frac{77}{3} } = x$

Answer 2

Answer:

$x = \sqrt{ \frac{77}{5} }$

Step-by-step explanation:

${x}^{2} - 4 {x}^{2} - 77 = 0 \\ 3 {x}^{2} + 77 = 0 \\ {x}^{2} = \frac{77}{3} \\ x = \sqrt{ \frac{77}{3} }$