Question

plzz answer this Q fasttttt​

Answer 1

Answer:

Step-by-step explanation:

FIRST MULTIPLY 1ST EQUATION BY 3,

=>   15x - 21x^2 - 18+ 3x^2 - 4x - 5

=>  -18x^2 + 11x - 23 ans.

#BRAINLIEST.

Answer 2

Answer:

$3(5x - 7x {}^{2} + 6) \\ 15x - 21x + 18 = - 3 \times 7(x - ( - \frac{1}{14} \sqrt{193 + \frac{5}{14} } )) \\ 3x {}^{2} - 4x - 5 = 3(x - \frac{1}{3} \sqrt{19} \frac{2}{3} \\ 3(21x {}^{4} - 43x {}^{3} - 33x {}^{2} + 49x + 30 \\ 63x {}^{4} - 129x {}^{3} - 99x {}^{2} + 147x + 90$

Step-by-step explanation:

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