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horsena [70]
3 years ago
10

Factor completely. x^2+3x−40

Mathematics
2 answers:
ahrayia [7]3 years ago
7 0
Factorised form: (x+8)(x-5)

Explanation:
This is a quadratic equation, so the easiest way to solve this is by splitting up the middle term. What are two numbers that when multiplied gives -40, and adds to give 3? (8, -5)

You can then split up the middle term like so:
x² + 8x - 5x - 40 = 0

and factorise x² + 8x and -5x -40.
x(x + 8) -5(x + 8) and group together like terms:
(x - 5)(x + 8)
Elan Coil [88]3 years ago
6 0

Answer:

For anyone who needs this in the future, it's (x + 5)(x - 8).

This is the answer I got from the 4.11 quiz.

Step-by-step explanation:

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190 cm²

Step-by-step explanation:

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Solve the system by graphing
Marta_Voda [28]

\left\{\begin{array}{ccc}-2x=2y-4\\2x-y=-5\end{array}\right\\\\2y-4=-2x\ \ \ \ |+4\\2y=-2x+4\ \ \ \ |:2\\y=-x+2\\for\ x=0\to y=-0+2=2\to(0,\ 2)\\for\ x=2\to y=-2+2=0\to(2,\ 0)\\\\2x-y=-5\ \ \ \ |-2x\\-y=-2x-5\ \ \ \ |\cdot(-1)\\y=2x+5\\for\ x=0\to y=2(0)+5=5\to(0,\ 5)\\for\ x=-2\to y=2(-2)+5=1\to(-2,\ 1)\\\\Answer:\ (-1,\ 3)\to\ x=-1,\ y=3

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