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Via inspection, one can factorise this via the difference of squares; since a^2-b^2 = (a+b)(a-b), therefore:100-x^2 = (10-x)(10+x)

1. Yesterday, I went to my friends house and we watched tv - Ayer, fui a la casa de mi amiga y vimos la televisión Next year, we are going to Spain together - El próximo año, vamos a España juntos
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The first step whenever you are given an equation is to group like terms. By this I mean put all the terms with the same letter next to it together and, in this case, the numbers without a letter. For the...

Place the mould(s) within the drag & fill with casting sand (compact well)
Turn the drag over & place the cope over the drag. Place sprue pins on the bottom of the mould(s) and fill the cope ...

First we can plug in the values we already know into the equation
we would get:
V² = 12² + (2 x -3 x 18)
then we would seperate the two multiplications on the right ...