Question

3x square + 12x + 20 = 308 please solve this quadratic equation​

Answer 1

Answer:

$3 {x}^{2} + 12x + 20 = 308 \\ \\ 3 {x}^{2} + 12x = 308 - 20 \\ \\ 3 {x}^{2} + 12x = 288 \\ \\ 3( {x}^{2} + 4x) = 288 \\ \\ {x}^{2} + 4x = 96 \\ \\ {x}^{2} + 4x - 96 = 0 \\ \\ {x}^{2} + 12x - 8x - 96 = 0 \\ \\ x(x + 12) - 8(x + 12) \\ \\ (x - 8)(x + 12) = 0 \\ \\ \\ x - 8 = 0 \\ \\ x = 8 \\ \\ x + 12 = 0 \\ \\ x = - 12 \\ \\ \\ (x = 8 \\ (x = - 12$

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