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Question: Factorise the expressions: 1. X^2 - 9 2. 2X^2 - 14X + 24

The ways to complete the first one is to realise that it involves a difference of two squares. If you were to see (X^2) with a constant (number), you know they have no factor in common, meaning the two terms...
YM
Answered by Yahya M. • Maths tutor
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What are the relative charges of the proton, neutron and electron?

The proton's relative charge is +1 The neutron's relative charge is 0 The electron's relative charge is -1.
AE
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The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5 Work out the area of the triangle

Perimeter= 72Ratios are 3:4:5In total, you can think of there being 3+4+5=12 "portions".This means that in the perimeter includes 12 portions. 72/12=6 so each portion is worth 6cm. Now we can work ...
NA
Answered by Natasha A. • Maths tutor
3276 Views

Why does magnesium oxide have such a high melting point?

Metal and non metal so ionic bondingStrong electrostatic forces of attraction between the positive and negative ionsWhich require lots of energy to break
LH
Answered by Lia H. • Chemistry tutor
5806 Views

What are the differences between the use of the preterite and imperfect tenses in Spanish?

The preterite and imperfect are both past tenses in Spanish. In general, the preterite tense is used to describe actions that took place in the past and are completed , while the imperfect is used for action...
MA
Answered by May A. • Spanish tutor
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