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Umnica [9.8K]
3 years ago
9

Factorise x2 + 13x + 42

Mathematics
1 answer:
kirill [66]3 years ago
8 0

Answer:

you can use the formula "<em>Cross method" </em>  in which the last number of the equation is the sum of 2 number multiplication that also sums the 2nd num of the equation.

so it becomes

(x +6)(x +7)

WHY?

Bcs when u multiply 6 x 7 = 42 ( the last number of the equation)

      when u sum 6 + 7 = 13 ( the 2nd number of the equation)

Hope this helps :)

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jarptica [38.1K]

Answer:

3/4 I think its that

Step-by-step explanation:

its a guess

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3 years ago
Find the equation of the line, in point-slope form then slope-intercept form, that
AleksandrR [38]

Answer:

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Step-by-step explanation:

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y2-y1/x2-x1

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3 years ago
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Travka [436]

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2/8 of a book in an hour

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8 0
3 years ago
Read 2 more answers
 If a 10-pound sack of potatoes costs $6.55, how much would 1 pound cost? Round your answer to the nearest cent. 
Black_prince [1.1K]
\begin{array}{ccc}10\ lb&-&\$6.55\\\\1\ lb&-&\$ x\end{array}\ \ \ |cross\ multiply\\\\\\\\10\cdot x=1\cdot6.55\\\\10x=6.55\ \ \ \ |divide\ both\ sides\ by\ 10\\\\x=\frac{6.55}{10}\\\\x=0.65\underline{5}\approx\boxed{\$0.66}\\

If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).

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Which expression represents it??
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