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IRINA_888 [86]
3 years ago
9

Multiply: (x – 4)(x + 5)

Mathematics
2 answers:
Galina-37 [17]3 years ago
5 0
<h2><u>FOIL</u></h2>

<h3>\mathbb{PROBLEM:}</h3>

» Multiply: (x – 4)(x + 5)

  • (a) x² + 5x - 20
  • (b) x² - 4x - 20
  • (c) x² - x - 20
  • (d) x² + x - 20

<h3>\mathbb{ANSWER:}</h3>
  • \tt \color{hotpink} \bold{{x}^{2}  + x- 20}

— — — — — — — — — —

<h3>Solution:</h3>

  • \tt \bold{ F} \to (x – 4)(x + 5) = \blue{ {x}^{2} }

  • \tt \bold{O } \to (x – 4)(x + 5) = \blue{ 5x}

  • \tt \bold{ I} \to(x – 4)(x + 5) = \blue{ -4x}

  • \tt \bold{L } \to (x – 4)(x + 5)  = \blue{ - 20}

So,

\to \:   \tt x {}^{2}  + 5x - 4x - 20  \\  \tt \:  =  \underline{ \boxed{ \purple{ \tt{ {x}^{2} + x - 20 }}}}

Hence, choice D is correct.

_______________❦︎_______________

Alenkasestr [34]3 years ago
4 0
<h3>Solution:</h3>

\small\bold{(x – 4)(x + 5)  }

\small\bold{ → x(x + 5) -4(x + 5) }

\small\bold{→ x2 + 5x – 4x – 20  }

\small\bold{ → x2 + x - 20 }

<u>Option (d) x2 + x - 20 is correct </u>

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