Question

please tell me ques no 3​

Answer 1

Step-by-step explanation:

$given \: equation - 2 {x}^{2} + 2x - 144 = 0$

$divide \: the equation \: by \: 2$

$we \: get - {x}^{2} + x - 72 = 0$

$we \: know \: that 72 = 8 \times 9$

$and \: 9 - 8 = 1$

$so \: we \: can \: write \: it \: as \: - {x}^{2} + 9x - 8x - 72 = 0$

$x(x + 9) + 8(x + 9) = 0$

$(x + 9)(x + 8) = 0$

$x + 8 = 0 \: \: \: \: \: \: \: \: \: \: \: \: \: x + 9 = 0$

$x = - 8 \: or \: - 9$