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3 years ago

Factorise x2 + x - 12

Mathematics

2 answers:

ahrayia [7]3 years ago

5 0

$x^2+x-12$
Answer:
$=(x-3)(x+4)$

lora16 [44]3 years ago

3 0

1,12
2,6
3,4
thats all
since its -12 , one will be negative and one will be positive.
since there's 1X, the two numbers differ by 1 only 3 & 4 fit so it's 4+ and -3
(X+4)*(X-3)

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3 years ago

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3 years ago

Question 15 of 43

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Answer:

Option A

Step-by-step explanation:

$\frac{12}{25} \times \frac{11}{24} \times \frac{10}{23} \times \frac{9}{22}$

we start with 12 red marbles out of 25 marbles, that's the probability for the first.

in the second step we have one red marble less, wich also means one marble less overall

and so on

$\frac{12 \times 11 \times 10 \times 9}{25 \times 24 \times 23 \times 22}$

$= \frac{11880}{303600}$

can be reduced by 1320 (step by step) to

$\frac{9}{230}$

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3 years ago