MCQ
Tick $(\checkmark)$ the correct answer:
$40 + 3x - x^2 = ?$
$40 + 3x - x^2 = ?$
- A$(x + 5)(x - 8)$
- B$(5 - x)(8 + x)$
- ✓$(5 + x)(8 - x)$
- D$(5 - x)(8 - x)$
✓
Answer
Correct option: C.
$(5 + x)(8 - x)$
C. $(5 + x)(8 - x)$
Solution:
$40 + 3x - x^2$
$= 40 + 8x - 5x - x^2$
${40 = 8x(-5), 3 = 8 - 5}$
$= 8(5 + x) - x(5 + x)$
$= (8 - x)(x + 5)$
Solution:
$40 + 3x - x^2$
$= 40 + 8x - 5x - x^2$
${40 = 8x(-5), 3 = 8 - 5}$
$= 8(5 + x) - x(5 + x)$
$= (8 - x)(x + 5)$
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