Question

simplify 2x(x-3)+x(x+6)and find its value for x=2​

Answer 1

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Answer 2

$2x(x - 3) + x(x + 6) \\ x = 2 \\ so \\ 2 \times 2(2 - 3) + 2(2 + 6) \\ 2 \times 4 - 6 + 4 + 12 \\ = \geqslant 8 - 6 + 4 + 12 \\ 8 - 6 + 16 \\ 24 - 6 \\ = \geqslant 18$