Factorise x^2-25
=(x-5)(x+5)
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In a village the number of houses and the number of flats are in the ratio 7 : 4 the number of flats and the number of bungalows are in the ratio 8 : 5 There are 50 bungalows in the village. How many houses are there in the village?
Solve the following simulatenous equation to find the values of both x and y: 5x+2y=16 3x-y=14
Q = P / (R (4-t)), P=36, R= 3, t=-2