Question

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Which of the following is the correct expansion of (x + 4)(x2 + 2x + 7)?


x3 + 6x2 + 8x + 7


x3 + 6x2 + 15x + 28


x3 + 15x2 + 15x + 28


x3 + 12x2 + 8x + 7

Answer 1

Answer:

${x}^{3} + 6 {x}^2 + 15x + 28$

Step-by-step explanation:

$({x} + 4) \times ( {x}^{2} + 2x + 7)$

${x}^{3} + 2 {x}^{2} + 7x + 4 {x}^{2} + 8x + 28$

${x}^{3} + 6 {x}^2 + 15x + 28$