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zmeister
11.06.2020 •
Mathematics
A) Expand and simplify (4x + 3)(2x - 5)
(2)
+
b) Factorise x2 + 5x + 6
(2)
Total marks: 4
Solved
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Ответ:
a.![8x^{2} -14x-15](/tpl/images/0682/6229/dc03a.png)
b.![(x+3)(x+2)](/tpl/images/0682/6229/7d89f.png)
Step-by-step explanation:
A. There are 3 methods (that I know of). The easiest method is the lattice multiplication, while the most commonly used is the FOIL method (First+Outer+Middle+Last)
For F, take the first terms of the 2 and multiply
For O, take the outer terms and multiply
For I, take the inner terms and multiply
For L, take the last terms and multiply
After that, add all of them up
B. Since the equation is in the form x^2+bx+c,
Now we need to find 2 numbers that will add up to 5 and multiply to 6.
Here are some of the combinations of numbers that multiply to 6
3*2
1*6
-3*-2
-1*-6
3 and 2 add up to 5 so:
Ответ:
2.9
Step-by-step explanation:
2.8962 rounded to the nearest hundred is 2.90