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Factorize x^2-x-20

Let's think backwards - what can we multiply to get this result?First, let's take a simpler example, an expression:(x-1)(x-2). We multiply 1st term of the 1st brackets by terms of the 2nd bracket and then we...
TB
Answered by Tomasz B. • Maths tutor
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Jason and Mary leave their houses at the same time. They travel towards each other, Mary at 20km/h and Jason at 15km/h. They pass each other after an hour and a half. What was the original distance between them when they started?

Mary = 20km/h Jason = 15km/h s = d/t After 1.5 hours, Mary = 30km and Jason = 22.5km 30 + 22.5 = 52.5km
ZC
Answered by Zac C. • Maths tutor
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What is a caesura in poetry and what effect can it have?

A caesura is a pause in the middle of a line of poetry. It usually comes in the form of punctuation, and the most common ones are full stops and commas. A full stop creates a harsher contrast between the fir...
ND
64478 Views

Solve y = x^2 + 3x + 2 = 0

Factorising gives: y = (x+2)(x+1) = 0. y only equals 0 when (x+2)=0 or (x+1)=0. Therefore x=-2 or x=-1
SL
Answered by Sean L. • Maths tutor
3368 Views

How are living organisms involved in the cycling of carbon?

Examples of living organisms involved in the cycling of carbon include plants, animals and microorganisms. Plants, for instance, take part in photosynthesis - a process through which carbon dioxide is taken ...
NM
Answered by Nafeesath M. • Biology tutor
7912 Views