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As we know the ratio of the sides is 3:4:5, label the sides x,y and z respectively. Side x is of length (3/12)*72, side y is of length (4/12)*72 and side z is of length (5/12)72. Giving, x = 18cm, y =...
By elimination:(eq1) 4x + 5y = 8(eq2) 2x + 3y = 5By eye you can see that 2x multiplied by 2 is 4x.If we multiply the whole of (eq2) by 2 we get:(eq2.1) 4x + 6y = 10(eq1) 4x + 5y = 8If we subtract the whol...
First expand (b-4)(b+5) b2-4b+5b-4*5Simplifyb2+b-20
First multiply the brackets to get: (2x2 - 6x + x - 3), Simplify to get: (2x2 - 5x - 3), This is then all multiplied by x to get: 2x3- 5x2 - 3x.
Firstly, it is important to understand here that "expand" means multiply the two brackets. A logical approach can be taken to this question. Deal with the first term (x^2) of the first bracket: ...
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