Question

17) Simplify 3(2x + 1) + 4x + 15 when x equal -1​​

Answer 1

Answer:

$3(2x + 1) + 4x + 15 \\ = 6x + 3 + 4x + 15 \\ = 10x + 18 \\ when \: x \: is \: equal \: to \: - 1 \\ = 10 x + 18 \\ = 10( - 1) + 18 \\ = - 10 + 18 \\ = 8$

Answer 2

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$3(2x + 1) + 4x + 15 \\ \\ \\ x = - 1 \\ \\ \\ 3(2 \times ( - 1) + 1) + 4 \times ( - 1) + 15 \\ \\ \\ 3( - 2 + 1) - 4 + 15 \\ \\ \\ 3 \times ( - 1) - 1 + 15 \\ \\ \\ - 3 - 4 + 15 \\ \\ \\ = 8$