Question

solve it x²+10xi-21=0​

Answer 1

Answer:

$x {}^{2} + 10x - 21 = 0 \\ x {}^{2} - 7x - 3x + 21 = 0 \\ x(x - 7) - 3(x - 7) = 0 \\ (x - 7)(x - 3) = 0 \\ \\ x = 7 \\ x = 3$

Step-by-step explanation:

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